Question # 1

The fringe spacing in case of blue light

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Increases

Remains the same

Decreases

None of these

SI unit of angular moment is

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Kgms^-1

Kgm²s^-2

Kgm²s^-1

Kgm³s^-1

The transmission of information by light waves may be

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An audio signal

A television signal

A computer data signals

All of them

The SI unit of heat is

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calorie

joule

electron volt

None of these

The vector sum of three vectors gives a zero resultant. What can be the orientations

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90^o

60^o

120^o

180^o

The couple arm is

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The smallest distance between two equal and anti parallel forces

The greatest distance between two equal and anti parallel forces

The lines of action of two equal and opposite forces

None of these

The state of rest and state of motion are

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Irrelevant

Relative

Both

None of these

While vibrating the atoms are at their

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Fixed positions

Extreme position

Average positions

None of these

If a wire is stretched to double of its length then the strain will be

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1

0.5

2

0

The energy required to charge a capacitor of 5 μF by connecting D.C source of 20 kV is

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10 kJ

5 kJ

2 KJ

1 kJ

Fahrenheit and centigrade (Celsius) thermometers have the same reading at

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-100°C

60°C

40°C

-40°C

If coplanar forces acting on a body form a closed polygon, then the body is said to be in equilibrium

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yes

False

Sometimes in equilibrium

None of these

The conductivity of super conductor at critical temperature becomes

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Zero

1

Infinite

Negative

A monochromatic source of light gives light of

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one colour

two colours

four colours

seven colours

Those quantities which can be measured accurately are known as

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Physical Quantities

Scalar Quantities

Vector Quantities

Non Physical Quantities

Name of projectile is the same for the following pair of angles:

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0° and 45°

35° and 55°

15° and 60°

30° and 75°

Angle subtended at the centre of the circle by a body is called

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Angular velocity

Linear velocity

Angular displacement

All of these

A 10 kg car is turning around a corner at 10 ms^-1. The radius of the circular arc is 10 m. Find the force between the types and pavement which is

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1.0 × 10⁶ N

1.0 × 10⁴ N

1.0 × 10² N

None of these

Deceleration means the speed of the body is

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Increasing

Decreasing

Just moving

None of these

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

The components of a fibre optic communication system is/are

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At transmitter

An optical fibre

Receiver

All of these

The law of conservation of energy is the base of

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Stoke's theorem

Carnot's theorem

Bernoulli's theorem

None of these

A positive charge is moved from a low potential point (A) to a high potential point (B) Then the electric potential energy

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Increases

Decreases

Will remain the same

Nothing definite can be predicted

A compound microscope is consists of objective of

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Long focal length and short focal length of eye piece

Objective of very short focal length and eye piece of long focal length

Objective of very short focal length end eye piece of also short focal length

None of these

The difference between two separated positions are given as X₁ = 10.5 ± 0.1 cm and X₂ = 26.8 ± 0.1 cm. What is their absolute uncertainty

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1.63 ± 0.1 cm

16.3 ± 0.2 cm

3 ± 0.1 cm

16.3 ± 0.05 cm

The velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s.The velocity 3s before in m/s is:

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8

4

6

7

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

Temperature remain constant the volume of given mass of a gas is inversely proportional to the pressure applied on it. it is called

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General gas law

Boyle's law

Charles law

None of these

Albert A. Michelson devised interferometer is

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1820

1845

1860

1881

Two forces of 6 N and 8 N can produce a resultant of

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0 N

1 N

10 N

18 N

The frequency of light ray is 6 x 10¹⁴ Hz. The frequency when it propagates in a medium of refractive index 1.5 will be

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6 x 10¹⁴ Hz

4 x 10¹⁴ Hz

9 x 10¹⁴ Hz

1.67 x 10¹⁴ Hz

An atom in which there is a resultant magnetic field behave like a

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Tiny magnet

Magnetic dipole

No magnet

a and b

The cross product of two perpendicular vectors has magnitude

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Maximum value

Minimum value

Zero

None of these

Two bodies with masses M_A and M_b are moving with equal kinetic energy.Their linear momenta are numerically in a ratio

|P_A| : |P_b| will be:

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M_b : M_A

M_A : M_b

√M_A : √M_b

M²_A : M²_B

A body will be in complete equilibrium, if

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any one of them

both of them

The renewable energy source is a biomass which is a

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Rare source

Unlimited source

Potential source

None of these

The relative permitivity ∈_r for teflon is

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2.1

2.4

2.9

3.0

The ratio of size of the image to the size of the object is called

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Resolving power

Magnification

Power

None of these

Modulus elasticity of any materiel is of the order of:

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10⁵

10²

10^-2

10^-5

10^-10

S.I. unit of angular velocity of

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Radian per second

Revolution per minute

Degree per second

None of these

In petrol engine, the second stroke is the

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Compression

In take

Power

None of these

When R^x is negative and R^y is positive, the resultant lies in the second quadrant and its direction is

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θ = 90 + Φ

θ = 180 - Φ

θ = 180 + Φ

None of these

Distance to nearest galaxy from earth is

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10¹⁰m

10¹⁵m

10⁴⁰m

10³⁰m

Steel is preferred for making permanent magnets because it has

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Large retentivity and large coercively

Small retentively and small coercively

Large retentively and small soercively

Small retentively and large coactivity

Which of the following is a scalar quantity?

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Displacement

Electric field

Acceleration

Work

For an elliptic orbit, the satellite has speed of

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30,0000 kmh^-1

35,000 kmh^-1

37,000 kmh^-1

None of these

A chocolate cookie is a circular disk of diameter 8.5 ± 0.02 cm and thicknes 0.050 ± 0.005 cm the average volume in cm³ is

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2.83 ± 0.3

2.38 ± 0.27

11.35 ± 1.2

9.31 ± 1.12

Each atom in a metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about the centre of the crystal

None of these

For glass-air boundary, the value of the critical angle is

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42°

45°

30°

60°

Electron volt is a unit of

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Potential difference

Energy

Charge

Power

For a freely falling elevator

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a = W

a = T

a = 0

a = g

The diffraction grating is used to determine

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Intensity of light

Wavelength of light

Refractive index of prism

None of these

The total linear momentum of an isolated system remains

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Constant

Variable

Zero

None of these

The typical speed of human swimming is

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1.5 ms^-1

2 ms^-1

2.5 ms^-1

3.0 ms^-1

The internal energy of molecules of a substance is

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K.Energy

P.Energy

Vibrational energy

All of these

If the velocity of a body becomes double and mass becomes half then its K.E

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Becomes double

Becomes four times

Is halved

Becomes eight times

A typical collector which absorbs energy directly from solar radiation upto about

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40 ^oC

70 ^oC

80 ^oC

90 ^oC

The force between two charges in 8 N. Now placed a mica of relativity 4 between two charges as a medium, the force then reduced to

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2 N

4 N

6 N

8 N

In Toricelli's theorem, the speed of efflux is equal to

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h₁ - h₂

Action of gravity

(h₁ - h₂) and falling under gravity

None of these

The product of resistance and conductance of a resistors is equal to:

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1

Conductivity

Resistivity

Zero

The system international (SI) is built from __________ kind of units

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Two

three

four

five

The displacement coincides with the path of the motion when a body moves in a

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curved line

straight line

either straight or curved

none of them

Who devise the experimental arrangement in 1801 for studying interference effects of light

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Huygen

Young

Newton

None of these

Stoke's law holds for bodies of the shape

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Spherical

Rectangular

Oblog

All of these

During a negative β-decayv

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An atomic electron is ejected

A neutron in the nucleus decays emitting an electron

An electron which already present within the nucleus is ejected

A part of binding energy of nuclei is converted into electron

A steel bar can bear a load of 20 tons. If the thickness of bar is double, then for the same depression it can bear a load of:

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40 ton

80 ton

160 ton

5 ton

The fringe spacing in case of red light

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Increases

Decreases

Remains the same

None of these

How many phone calls can be carried by single mode step index fibre

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25000

96000

14000

21000

All of the following statements are correct except

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The total focal length of an astronomical telescope is the sum of the focal lengths of its two lenses

The image formed by the astronomical telescope is always erect because the effect of the combination of the two lenses is divergent

The magnification of an astronomical telescope can be increased by decreasing the focal length of the eyepiece.

In the expression F x t the fore F is

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total force

instantaneous force

average force

all of them

Substances which undergo plastic deformation until they break are called:

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Ductile

Brittle

Malleable

Soft

Hard

Arsenic, antimony and phosphorous are the elements from

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third group

fourth group

fifth group

none of them

One erg is equal to

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10⁵j

10^{7 j}

10^-3 j

10^-7j

The typical speed of human swimming is

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1.5 ms^-1

2 ms^-1

2.5 ms^-1

3.0 ms^-1

In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width

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Becomes doubled

Becomes 4 times

Is halved

Remains the same

The high-tensile steel used to support the roadway of a suspension bridge breaks under a stress of 2 x 10⁹Pa. Find the minimum cross-sectional area for a cable if it is to support a load of mass 2 x 10⁵kg.

(g = 10 N kg^-1)

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10^-2m²

10^-1m²

10^-4m²

10^-3m²

A proton is about 1840 times heavier than an electron When it is accelerated by a potential difference of 1 kV,its kinetic energy will be:

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1840 keV

1/1840 keV

1 keV

920 keV

The projectile motion is composed of

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horizontal motion only

vertical motion only

horizontal and vertical motion

none of them

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structures are

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5

7

9

14

The approximate efficiency of steam turbine is

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35 - 46%

40 - 43%

29 - 36%

30 - 47%

Accuracy of a measurement depends on

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Percentage uncertainty

Fractional uncertainty

Less absolutely

None of these

We can observe only when the grating spacing is

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of the order of the wavelength used

greater than the wavelength used

less than the wavelength used

any one of them

The time constant is the time required to deposit the equilibrium charge

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63 times

36 times

0.63 times

0.36 times

The deformation measured in terms of some twisting angle due to action of stress is known as

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Stress

Linear stress

Compressive stress

Shear stress

The efficiency of a practical heat engine:

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Can be 100%

Can not be 100%

Is always Zero

None of these

The time taken by the light to travel from Sun to Earth is

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4 min 20 sec

5 min 20 sec

8 min 20 sec

9 min 20 sec

Work done is a gravitational field along a closed loop is

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Maximum

Minimum

1

Zero

On heating, glass gradually softens into a paste-like state before it becomes a very viscous liquid at almost

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600°C

7600°C

800°C

900°C

Beta particles have penetration of about:

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100 times more than that of the gamma particles

100 times less than that of an alpha ray

100 times more than that of an alpha ray

10 times more than that of an alpha particle

Stress that induces a change in the shape of the body is named as

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Tensile stress

Volumetric stress

Shear stress

None of these

At what point/points in its path does a projectile have its maximum speed

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At the point of projection

At the point where its strikes the ground

Both

None of these

A frame of reference stationed on Earth is approximately an example of

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Inertial frame

Non-inertial frame

Every frame

None of these

In a full wave rectifier with input frequency 50Hz. The frequency of pulsating D)C) received as an output across the load is

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50 Hz

100 Hz

500 Hz

zero

The horizontal velocity component in projectile motion is

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Zero

Constant

Maximum

None of these

A progressive sound wave is a means of transferring energy. A progressive sound waveof constant frequency is generated in air. The intensity of energy transfer is directlyproportional to another of the wave parameters. Which of the following is correct?

Choose an answer

Intensity 𝖺 (𝑎𝑚𝑝𝑙𝑖𝑡𝑢𝑑𝑒)²

Intensity 𝖺 (𝑝𝑒𝑟𝑖𝑜𝑑𝑖𝑐 𝑡𝑖𝑚𝑒)²

Intensity 𝖺 (𝑠𝑝𝑒𝑒𝑑)²

Intensity 𝖺 (𝑤𝑎𝑣𝑒𝑙𝑒𝑛𝑔𝑡ℎ)²

A closed organ pipe and an open organ pipe have their first overtones of identicalfrequency. Their respective lengths are in the ratio:

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1 : 2

4 : 3

2 : 3

3 : 5

An object is placed at a distance 18 cm from a convex lens. The image is formed at a distance of 9 cm the focal length of the lens is

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6 cm

9 cm

10 cm

18 cm

A 2 kg body and a 2 kg body have equal momentum. if the kinetic energy of 3 kg body is 10 j. The K.E of 2 kg body will be

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6.66 j

15 j

22.5 j

45 j

An image formed by a concave lens is always

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Virtual

Real

Inverted

None of these

The curie temperature for iron is

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750°C

570°C

750°k

57°K

The phenomenon of geothermal energy is a geyser. It is a hot spring that discharges

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Steam

Hot water

Both

None of these

The sky appears blue because

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Red light is absorbed

Blue light is scattered the most

Blue light is absorbed

It is its natural color

The efficiency of full wave rectifier is:

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25.6%

81.2%

81.6%

71.2%

The difference between 1st ring fringe and 1st dark fringe is measured as

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λD/2d

λD/d

λD/4d

2λD/d

Scientific notation which can be expressed in the

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Negative powers

Powers of ten

Decimals

None of these

The percentage errors in the measurements of mass and speed are 2% and 3% respectively.How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed.

Choose an answer

11%

8%

5%

1%

Which of the particles, electron, proton and neutron moving with same speed has longest wave length?

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Electron

Proton

Neutron

All have same

The resolving power of a grating spectrometer is

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When a droplet falls through a medium with terminal velocity the acceleration is

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Maximum

Minimum

Constant

Zero

If one atom or molecule lies out each of the eight corners of a cube, it is called

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Simple cube

Face centered cube

Body centered cube

None of these

Which of them is not a physical quantity

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Density

Impulse

Energy

Kilogram

Bulk modulus for copper is

Choose an answer

50

75

140

147

A stethoscope detects the instant at which the external pressure is

Choose an answer

Greater than systolic pressure

Equal to systolic pressure

Lower than systolic pressure

None of these

The value of Faraday number is SI unit is

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9.65 Coulomb/kg/equivalent

9.65 x 10⁷Coulomb/kg/equivalent

9.65 x 10^-7Coulomb/kg/equivalent

9.65 Coulomb/kg/equivalent

The rate of decay radioactive substance:

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Is constant

Decrease exponentially with time

Varies inversely with time

Decrease linearly with time

A ballistic missile is

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Unpowered

Unguided

Both

None of these

How the fringe spacing varies as the separation of the slits increases

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Increases

Decreases

Increases very little

None of these

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

Choose an answer

impurification

adding

doping

extrinsivity

The fine rulings on a compact disc as a diffraction grating but each line is wide like

Choose an answer

0.01 μm

0.5 μm

0.05 μm

0.6 μm

For the sustained interference of light the necessary condition is that the two sources should

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Have constant phase difference

Be narrow

Be close to each other

Of same amplitude

The expansion or compression must take place slowly in order to keep constant

Choose an answer

Volume

pressure

Temperature

None of these

Optically active substance are those substance which

Choose an answer

Produce polarization of polarized light

Rotate the plane of polarization of polarized light

Produce double refraction

Both a and b

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be

Choose an answer

6 x 10^-5rad

7 x 10^-5rad

8 x 10^-5rad

None of these

If Rx is positive and Ry is negative, the resultant lies the fourth quadrant and its direction is

Choose an answer

θ = 180 + Φ

θ = 360 + Φ

θ = 360 - Φ

None of these

The body is in a state equilibrium when it is

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At rest

In motion

In rotation

None of these

Weightlessness experienced by the spaceship is due to

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Absence of gravity

Absence of inertia

Free fall of spaceship

All of these

When the second condition of equilibrium is satisfied, the body has

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no linear acceleration

no angular acceleration

F_x= 0

none of them

In a soft iron, domains are

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easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random positions

do not oriented along external field and also do not returns to original random position

none of them

Conventionally, all the distances p, q, f, are measured from ______ of the lens

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Focus

Optical center

Edges

Centre of curvature

The original source of fossil fuels is

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Geothermal

Biomass

Sun

None of these

The acceleration due to gravity on a planet with mass and radium half that of earth will be

Choose an answer

g

2/g

12 g

For a freely falling elevator everything in it

Choose an answer

Will have maximum weight

Will have minimum weight

Will be weightless

None of these

SI unit of work is

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N-m

N-m²

N-ms^-1

N-ms^-2

The bottom of a container filled with liquid appear slightly raised because of

Choose an answer

Refraction

Interference

Diffraction

Reflection

Vector A lies in the XY-plane. For what orientation will its components have opposite signs ?

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II-quadrant

III-quadrant

IV-quadrant

a and c

Rest mass energy of electron is:

Choose an answer

1.02 MeV

0.51 MeV

931 MeV

200 MeV

Colour of thin film will not show result from

Choose an answer

Scattering of light

Dispersion of light

Interference of light

Both a and b

When a body moves with increasing acceleration, its velocity-time graph is a

Choose an answer

straight line

horizontal straight line

vertical straight line

curve

When two semiconductors of p- and n-type are brought into contact, they from a p-n junction which act like a:

Choose an answer

Conductor

Amplifier

Oscillator

Rectifier

If Young s double slit experiment is immersed in water then the fringes with

Choose an answer

Decreases

Remains unchanged

Becomes infinite

Increases

Inkjet printer can produce

Choose an answer

Black and white copy

Coloured copy

Both

None of these

If the line of action of force passes through the axis of rotation or origin then its torque is

Choose an answer

Maximum

Zero

Negative

Non-zero

Period of vibration of an atom in a solid is

Choose an answer

1 × 10^-10 sec

_{1 × 10}^-13_sec

1 × 10^-16 sec

1 × 10^-19 sec

If we keep the moment arm, fixed while change the force, then, the torque is

Choose an answer

Changed

Does not change

Some what change

None of these

The methods used for the conversion of biomass into fuels are

Choose an answer

Fermentation

Direct combustion

Direct sunlight

a & b

The velocity of efflux is 100 m/sec and area of hole is 0.06 cm²how much volume of water will flow out of hole in one second

Choose an answer

6.0 x 10-⁴m³

6.0m³

600m³

6.0cm³

The vertical and horizontal range will be equal if angle of projection is

Choose an answer

76°

45°

60°

120°

The property of light which does not change with the nature of the medium is

Choose an answer

Frequency

Amplitude

Wavelength

None of these

Each atom in a metal crystal vibrates about a fixed point with a amplitude that:

Choose an answer

Decreases with rise in temperature

Is not affected by rise in temperature

Increases with rise in temperature

Both B and C

None of these

If the temperature difference between hot and cold body is greater the heat engine is:

Choose an answer

Not efficient

Less efficient

More efficient

NOne of above

The term impulse means, the force applied on a body for

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Permanently

Temporary

Very short interval of time

None of these

Hysteresis is the loop in which the material is magnetized and its curve never pass through

Choose an answer

The same line

One side of origin

Origin

None of these

In full wave rectification, the output D.C. voltage across the load is obtainedfor

Choose an answer

The positive half cycle of input A.C. (C) The complete cycle of input A.C.

The negative half cycle of input A.C.

The complete cycle of

All of the above

Spectrum of sun consists of

Choose an answer

Bright lines

Dark lines

Bright bands

Dark bands

An oil surface floating on water surface exhibits beautiful colour patter, which is due to

Choose an answer

Reflection of light

Diffraction of light

Interference of light

None of these

The speed of light in vacuum or in air is

Choose an answer

3 x 10¹⁰ m ! s

3 x 10⁹ m ! s

3 x 10⁸ m ! s

3 x 10⁷ m ! s

The subtances which break just after the elastic limit is reached are known as:

Choose an answer

Ductile

Brittle

Malleable

Hard

Soft

Measurement of a standard metre in terms of the wavelength of red cadmium light is

Choose an answer

1,563,163.5

1,553,363.5

155,553.5

1,553,163.5

The velocity of light in vacuum can be changed by changing

Choose an answer

Frequency

Amplitude

Wavelength

None of these

A solid subjected to deformation along one dimension

Choose an answer

Only have tensile stress

Only have compressive stress

Have both tensile and compressive stress

None of them

When a crystal is subjected to stress, it tends to break or fracture along definite direction which is characteristic of a simple. This is called

Choose an answer

Cleavage

Allotropy

Isotropy

None of these

One Pascal in SI is equal to

Choose an answer

One newton metre

One newton metre^-1

One newton metre^-2

One dyne cm²

Which of the following is a non-conservative force

Choose an answer

Nuclear force

Elastic force

Electrostatic force

Viscous force

What are the rations among the volumes of gases of ³²O₂,²H₂ and ¹⁶CH₄, If they taken in equal masses?

Choose an answer

2 : 16 : 1

2 : 16 : 2

1 : 1 : 1

1 : 16 : 2

In case of point source of light, shape of wavefront is:

Choose an answer

Spherical

Cylindrical

Plane

None of these

For the conversion of heat into work, the two bodies are essential as temperature which is

Choose an answer

Similar

Very little difference

Large difference

None of these

nuclear physics deals with

Choose an answer

Atom

Atomic nuclei

Elementary particles

Light

The amount of heat required to raise the temperature of one mole of a substance through

Choose an answer

1 C°

1 K

0 K°

None of these

When the second condition of equilibrium is satisfied, the body will be in

Choose an answer

complete equilibrium

translational equilibrium

rotational equilibrium

all of them

A shortsighted person can see clearly

Choose an answer

Near objects

Far objects

Objects at 25 cm

Objects at infinity

Light signals in an optical fibre eventually become dim and must be regenerated by devices called

Choose an answer

transmitters

receivers

photodiodes

none of them

If we have two vectors of magnitude 4 and 5 respectively and between them is 60°, what is magnitude of resultant

Choose an answer

4

8

2

3

In everyday life, when two balls collide then after collision, they the velocities as before the

Choose an answer

greater than the velocities as before the impact

equal to the velocities as before the impact

less than the velocities as before the impact

none of them

Keeping in view the Earth surface the value of g on the equator is

Choose an answer

Zero

Minimum

Maximum

None of these

The approximate efficiency of solid state laser is

Choose an answer

35%

30%

27%

23%

A magnetic field

Choose an answer

Always exerts a force on a charged particle

Never exerts a force on a charged particle

Exerts a force on a charged particle if it is moving across the magnetic lines of force

Exerts a force on a charged particle if it is moving along the magnetic lines of force.

If λ = 589 nm d=1.0 mm L=225 cm then fringe spacing ΔY is given by

Choose an answer

1.76 mm

1.80 mm

1.37 mm

1.33 mm

An optical fibre with its protective case may be typically

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6 m

6 mm

6 cm

6 nm

The valence energy band can never be

Choose an answer

Filled

Partially filled

Empty

None of these

SI unit of water equivalent of electrons is

Choose an answer

Kg

Kg²

Kg³

Kg¹

For an ideal gas system, the internal energy and temperature are

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Directly proportional

Inversely proportional

Neither direct nor inversely proportional

None of these

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

Mathematically the first condition for equilibrium can be expressed as

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ΣF_x = 0

ΣF_y = 0

ΣFx = 0 and ΣF_y = 0

ΣFx = 0 or ΣF_y = 0

X-ray diffraction has been very useful in determining structure of

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Hemoglobin

Double helix structure of DNA

Blood speed

a and b

Which of the following is an example of Brittle substances?

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Copper and Brass

Brass and glass

Copper and glass

Only glass

Relativistic mechanics was developed by

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Davison and Germer

Heisenberg

Max Planck

Albert Einstein

In YDS experiment, data given isλ= 500 nm, L = 100 cm,Δy comes out to be

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0.5 cm

0.5 mm

0.5 nm

0.5 m

At what point/points in its path does a projectile have its maximum speed ?

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At the point of projection

At the point where its strikes the ground

Both

None of these

The locus of all the points in the same phase of vibration is called:

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Wave packet

Wavefront

Wave number

None of these

In semiconductors, the valence band at room temperature is

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Completely filled

Partially filled

Empty

None of these

The power loss can also take place due to

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Information received can be inaccurate due to dispersion

Light signal may not be perfectly monochromatic

Signal accuracy may be affected by deflective source

All of these

The direction of torque can be determined by

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Head to tail rule

Right hand rule

Left hand rule

None of these

By the pull of moon, the land up and down by as much as

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16 cm

25 cm

12 cm

10 cm

In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

The atmosphere is held to the earth by

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Winds

Gravity

Clouds

The rotation of earth

Find the range of the projectile, having speed 30 ms^-1in a direction 30^o above the horizon

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50 m

80 m

90 m

100 m

When light passes through a tourmaline crystal, it becomes

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plane polarized

directly polarized

un-polarized

spherically polarized

The density of human blood is equal to that of

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Oil

Glycerin

Honey

Water

In the equation PV^γ= constant, the valueγof is unity then the process is

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Isothermal

Adiabatic

Isobaric

Irreversible

Change in length divided by original length is called:

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tress

Young's modulus

Strain

Both (B) or (C)

None of these

Ray optics is valid,when characteristic dimensions are

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Of the same order as the wavelength of light

Much smaller than the wavelength of length

Of the order of one millimeter

Much larger than the wavelength or light