Question # 1

The speed \velocity of sound is greatest in.

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Air

Steel

Ammonia

Water

A direction of torque is

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Along the position vector r

Perpendicular to both r and f

Along the direction of force F

Opposite to the direction of r

the acceleration along x -axis direction in case of projectile is.

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Zero

Equal to gravity

Maximum

Constant

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

The instrument which detects the instant as which the external pressure becomes equal to the systolic pressure is called.

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Manometer

Sphygmomanometer

Barometer

Stethoscope

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

The action and reaction never act on

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Same body

Two bodies

many bodies

All of these

Diffraction is a special type of

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Reflection

Polarization

Interference

Refraction

If amplitude of a simple pendulum is increased by 4 times the time period will be.

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Four times

Half

Same

Two times

A man of 5000 kg moves with an acceralation of 1 ms-2 force acting on it is.

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5 N

500 N

50 N

5000 N

An elevator is moving up with an acceleration equal to 'g' An apparent weight of the body in an elevator is.

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Zero

Equal to real weight

2 mg

3 mg

A communication satellite is used ot reflect the signal of.

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Microwaves

Radio waves

y rays

x -rays

A frame of reference stationed at the earth is an

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Inertial frame

None internal frame

Accelerated frame

Laboratory frame

Angular acceleration is produced by

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Power

Torque

Pressure

Force

At which of the following temperature a body has maximum internal energy.

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-273 ^oC

0 K

273 K

-273 K

If a stretched string 4 m long and it has 4 loops of stationary waves, then the wave length is.

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1m

2 m

3 m

4 m

The space within which gravitational force acts on a body is called

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Electric field

Gravitational field

Magnetic field

Force field

Change of momentum is equal to

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Force

Tension

Impulse

Pressure

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11th Class Part 1 Physics Test Online MCQs With Answers

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