Online Test

Question # 1

A force applied on a body produces acceleration in

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Its opposite direction

Its own direction

Right angle to the force

None of these

Examples of polymers are

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Polythene

Polystyrene

Nylon

All of them

The number of protons inside a nucleus is called

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mass number

atomic number

atomic weight

none of them

A fly is sitting on the objective of a telescope pointed towards the moon.What effect is expected on the photography of the moon taken through the telescope?

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The entire field of view blocked

There is an image of the fly on the photography

There is no effect at all

There is a reduction in the intensity of the image

Age of earth is approximately

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1.4 x 10¹⁷years

5 x 10¹⁷s

1.4 x 10^-17s

1.4 x 10⁷

The positron has charge which is in magnitude equal to the charge on:

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Electron

Proton

ß-particle

All

Neutron was discovered in 1932 by

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Bohr

Chadwick

Dirac

Fermi

The temperature of the surface of sun is about

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5 million degree Celsius

10 million degree Celsius

15 million degree Celsius

20 million degree Celsius

High temperature water with pressure, come to the surface as

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Hot springs

Geysers

Steam vents

All of these

A voltmeter is used to measure the

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potential difference

current

temperature

resistance

In which process the P - V diagram is a straight line parallel to volume axis

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Isobaric

Isothermal

Isochoric

Adiabatic

For making cooking utensils,which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

If material object moves with the speed of light 'c' its mass becomes

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equal to its rest mass

four times of its rest mass

double of its rest mass

infinite

A stretched wire with clamped ends has a fundamental frequency of 1000 Hz. What will be the new fundamental frequency if the tension in the wire increase by 2 times

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980 Hz

√10Hz

300Hz

10√2 Hz

In Young's double slit experiment,the separation between the slits is made 3 fold the fringe width becomes

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1/3 times

1/9 times

3 times

9 times

According to the first condition for equilibrium, the vector sum of all the forces acting on a body must be equal to

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The maximum value

The minimum value

A negative value

Zero

The unit of conductance is

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ohm

metre

mho

ohm-metre

When temperature increases the frequency of a tuning fork

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Increases

Decreases

Remains same

Increases or decreases depending on the material

According o Einsteins theory space time is

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Just coordinates

A straight line

Curved

None of these

Identify the correct unit of pressure among t bese

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kgms^-1

kgm^-1s^-2

kgm²s^-2

kgm^-2s^-1

Which of the following is unit of energy

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g cms^-2

Kilowatt

Watt day

Js^-1

The equations for uniformly accelerated motion for body moving at

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Acceleration

Constant acceleration

Instantaneous acceleration

None of these

Minimum energy required to take out the only one electron from ground state of He⁺ us

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13.6 eV

54.4 eV

27.2 eV

6.8 eV

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both A and C

Both B and C

The radial magnetic field produced in a moving coil galvanometer is due to

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Iron Cylinder

Turns of coil

Concave pole pieces

None of these

When the velocity of the car is constant. The velocity time graph is a

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Straight line

Straight line rises the same height for equal intervals of tome

Horizontal straight line

None of these

The value of 'γ' for polyatomic gas is

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1.40

1.67

1.17

1.29

If two waves of amplitude 'a' produce a resultant wave of amplitude a then the phase difference between them will be

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60°

90°

120°

180°

When refractive index of core is 1.50 and of 1.48 of cadding then find the angle of entry for an optical fibre is

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11.2^o

14.2^o

15.4^o

13.6^o

Which of the following radiation will be focused farthest from a convex lens

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X - rays

γ - rays

Microwaves

β - rays

Spokes used in a bicycle wheel increase its

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Moment arm

Moment of inertia

Acceleration

Velocity

The relation λ_max × T = Constant represents

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Stepfen's law

Planck's law

Wein's law

None of these

Tracers are widely used in medicine to detect

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Reactions in plants

Malignant tumors

Plant improvement

None of these

When the atomic particles are moving with velocities approaching that of light:

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Newton's laws become valid

Relativistic effects become prominent

Both A and B are valid

Neither A nor B

Their mass becomes zero

The drift velocity of electron is of the order of

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10⁹ ms^-1

10^-6 ms^-1

10^-4 ms^-1

10^-3 ms^-1

Heat rollers make the copy

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Heated

Tone melted

Dry

All of them

In an adiabatic process

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Temperature remains constant

Volume remains constant

No change of internal energy

No heat enters for leaves the system

The more general form of second law of motion is

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F = ma

F × t = mV_f - mV_i

Both

None of these

The threshold frequency of the photoelectrons is v₀.The light is at frequency v.Then which of the following is correct for the emission to take place?

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V = V₀

V = 2 V₀

V < V₀

V > V₀

Which of the given elements is a diamagnetic material

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Antimony

Bismuth

Copper

All of these

Ordinary light has components of vibrations in

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one direction only

two directions

four directions

all directions