Question # 1

The rate of doing work is called :

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Power

Work

Efficiency

None of above

in isolated system the momentum after collision of two bodies.

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Increase

Constnat

Decrease

Zero

The unit of velocity and speed is.

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ms

ms^-2

ms^-1

ms-3

A body is in neutral equilibrium when its centre of gravity:

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Is at its highest position

Is at the lowest position

Keep its height if displaced

Is situated at its bottom

The boiling point of mercury is:

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-10 ^oC

150^oC

375^oC

457^oC

The centre of gravity of uniform triangle is:

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Point of intersection of medians

On its vertex

On middle point of its axis

Point of intersection of diagonal

The velocity of geostationary satellites with respect to Earth is

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Vo

2Vo

Zero

1/2 Vo

The ratio of useful output to input energy is called:

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Power

Energy

Efficiency

Horse power

1 MJ=

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10³ J

10⁶J

10⁷J

10^-3J

The weight of body is 147 N, Its mass will be ________ when g = 10 ms^-2

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1.47 kg

14.7 kg

47 kg

1.51 kg

1 Newton =_________

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1 kg ms^-2

1 kg ms

1 kg m^-1s^-2

1 kg^-1m^-1 s^-1

The resistance of conductors is due to:

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Protons

Fixed atoms

Molecules

Neutrons

The step-up transformer

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Increases the input current

Increase the input voltage

Has more turns in the primary

Has less turns in hte secondary coil

Human skin, in dry conditions, has a resistance of:

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20,000 ohm

100,000 ohm

30,000 ohm

2000 ohm

An object is 14 cm is front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror?

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4.1 cm

8.2 cm

9.9 cm

20 cm

1 Pico Farad is equal to:

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10^-9F

10^-12F

10¹²F

10^-6F

Safe limit of radiations exposure in one year.

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4 rem

5 rem

3 rem

6 rem

electric field is weak when:

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lines are far apart

lines are close together

no lines are present

lines are directed outside

The character by which lound and faint sound can be distinguished is called:

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Pitch

Quality

Loudness

Intensity

The S.I unit of electric current is:

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Volt

Ampere

Coulomb

Watt

The S.I unit of potential difference is:

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Ampere

Coulomb

Volt

Watt

A converging mirror with a radius of 20cm creates a real image 30 cm from the mirror. What is the object distance:

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5.0 cm

7.5 cm

15 cm

20 cm

The area between velocity time graph and the time axis is numerically equal to.

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?Speed of object

Distance covered by the object

Average velocity of the object

Acceleration of the object.

According to Huygen's principle the points on primary wave front can be considered as

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Secondary wavelets

Ray of light

Source of light

None of these

The amount of inertia of 10 kg hoop about the axis of rotation perpendicular to its plane having radius 5 m is

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50 kgm2

100 K gm2

150 K gm2

250 K gm2

The relation between linear and angular velocity is

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The maximum range of projectile is 100 km, Take 9=10 ms-2, the initial velocity of the projectile will be.

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1000 kms-1

1 kms-1

10 kms-1

100 kms-1

Horizontal range is maximum when the angle of projectile is.

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0 o

30 o

45 o

60 o

If a body is moving in the counter clockwise direction the direction of angular velocity will be

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Toward the centre

Away from the centre

along the linear velocity

Perpendicular to both radius and linear velocity

The shortest distance between two points is called

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Distance

Amplitude

Displacement

Is a number

If focal length of objective and eye piece is 0.5 m and 10 cm respectively then magnifying power of telescope will be.

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0.5

5

10

20

Torricelli's theorem is given by

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A Carnot engine has an efficiency of 50% when its sink temperature is at 27 ^oC. The temperature of source.

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273^oC

300 ^oC

327 ^oC

373 ^oC

Grid in cathode ray oscilloscope controls.

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Number of electron

Temperature of filament

Frequency of electron

Energy of electrons

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

The motional emf is give by

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qvB

IBL

eBL

vBL

There is regular arrangement of molecules in:

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Amorphous solids

Crystalline solids

Both a and b

None of above

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

In RLC circuit the energy is dissipated in

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R only

R and L

R and C

L and C

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

The dimensions of magnetic flux are

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M¹L^-2T¹A¹

MLT^-2A^-1

ML²T²A^-1

ML²T^-2A^-1

Number of Isotopes of Neon gas are

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2

3

4

1

In full wave rectification number of diodes required are equal to.

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2

3

4

5