Question # 1

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

If the two charges in Coulomb's law have double distance between them, then electric force

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Becomes two-fold

Becomes four-fold

Remains the same

None of these

The body oscillates due to ______ accelerates and overshoots the rest position due to _______

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Applied force, Inertia

Restoring force, Friction

Frictional force, Inertia

Restoring force, Inertia

Pair production is the phenomenon in which

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matter is converted into energy

energy is converted into matter

light is converted into electrical energy

electrical energy is converted into light

Pressure may be define as _______ per second per unit area:

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Change in force

Change in momentum

Change in energy

Work done

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rev/sec²

-10 rad/sec²

-5 rev/sec²

The change of magnetic flux through a circuit will produce

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Magnetic Field

Electric Field

emf

a.c

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to

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Four times

Thrice

Once

Twice

The vertical component of velocity of a projectile during its motion is minimum

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at the time of projection

at the highest point

just before hitting the plane of projection

all of them

The direction of the acceleration is the same as that of

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Displacement

Velocity

Both

None of these

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

The temperature at which all the gases become liquid is called:

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273 K

-273 K

Absolute Zero

Both (B) and (C)

The transition of from solid to liquid is actually from:

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Order to disorder

Disorder to order

Order to order

Disorder to disorder

The phase difference between two points on a wave front will be

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0°

4π

2π

π/2

Wavelength of X-rays falling at a glancing angle of 30° on a crystal with atomic spacing 2 x 10^-10m for first order diffraction is

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4 x 10^-10m

2 x 10^-10m

0.2 x 10^-10m

20 x 10^-10m

The maximum drag force on a falling sphere is 9.8 N,it weight is

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1 N

9.8 N

4.9 N

Cannot be calculated

The approximate efficiency of fossil fuel power plants is

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20 - 27%

30 - 40%

40 - 50 %

40 - 42%

The light produced by a laser is all the following except

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Incoherent

Monochromatic

In the form of a narrow beam

Electromagnetic

Only those processes are probable to take place for which entropy os the system:

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Increases

Remains constant

Both A and B are correct

None of above

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