Question # 1

When a wall is pushed by a person very strongly, he has done:

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Maximum work

Zero work

Positive work

Negative work

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

Photocell is a device which converts

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chemical energy into electrical energy

electrical energy into light energy

heat energy into electrical energy

light energy into electrical energy

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

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deuterium

protium

tritium

none of these

Which one of the least multiple:

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Pico

Femto

Nano

Atto

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

A ball of mass m moving with uniform speed collides elastically with another stationary ball. The incident ball will lose maximum kinetic energy when mass of the stationary ball is

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m

2 m

4 m

Infinity

Speed of light in vacuum depends upon:

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Frequency

Wavelength

Amplitude

None of these

The unit of work function is:

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Joule

Electron volt

That of threshold frequency

Both (A) and (B)

None of these

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

The principle of rocket motion is based on the

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First law of motion

Second law of motion

Third law of motion

None of these

The fringe spacing in case of blue light

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Increases

Remains the same

Decreases

None of these

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

The venturi meter is a device used to measure the fluid

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Pressure

Quantity

Temperature

Speed

For the measurement of temperature of the order of 400°C, we will prefer

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Hg thermometer

Alcohol thermometer

Pyrometer

Thermometer

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

Relation between range and maximum range is

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R=R_max Sinθ

R=R_max Sinθ/2

R=R_max Sin2θ

R_max = RSin2θ

Who gave the corpuscular nature of light

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Einstein

Newton

Maxwell

Thomas young

In case of diffraction grating, unit of grating element is:

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Centimeter

Kilometer

As that of g

as that of angle

A disc of moment of inertia is 5 x 10^-3 kgm² is making 20 rad/sec. The torque required to stop it in 10 sec is

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1x10^-3 Nm

1x10^-2Nm

0.1x10^-3 Nm

None of these

A jet engine works on the principle of

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Conservation of linear momentum

Conservation of mass

Conservation of energy

Conservation of angular momentum

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