Question # 1

Which one of the following is not a dimensionless quantity.

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Radian

pi

Decibel

Force

The angular momentum of a body about a fixed point is conserved if its velocity

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Decreases

Increases

Remain the same

Becomes zero

When the lift is moving upward with an acceleration then weight of the object will be.

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w = ma

w - ma

w

2 w

A 100 kg box is pulled 10 m across a frictionless horizontal surface by a 50 N force The change in the P.E. of the box a

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0 J

2 J

20 J

50 J

Light year is a unit of

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Light

Velocity

Time

Distance

The SI unit of density is.

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kg m2

kg m-2

kg m-3

kg m2 s-2

When a projectile reaches the highest point the vertical component of velocity becoems.

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Small

Vi cos thetha

Zero

Maximum

If the resultant of two forces, each of magnitude F have the magnitude F, angle between the forces will be.

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30^o

80^o

90 ^o

120 ^o

Which of the following is renewable source of energy.

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Oil

Natural gas

Uranium

Sunlight

A force of 50 N acts on a body for 10 s What will be change in momentum.

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5 Ns

500 Ns

200 Ns

800 N s

The maximum height reached by a projectile with a velocity of 14 m s-1 at an angle of 30 ^owith the horizontal is.

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1.5 m

2.5 m

1 m

2 m

A man of mass 100 kg is standing in an elevator. The net force acting on the man reads its weight when the elevator is going up with acceleration 4 m s-2 would be.

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100 N

590 N

490 N

980 N

Which vector gives the displacement from one point another in space.

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Null vector

Position vector

Unit vector

Distance vector

By decreasing angle between two vectors their cross product.

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Increases

Decreases

Remains the same

Vanishes

Which of the following is an example of negative work.

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a thrown up cricket ball

Grass mower

A car on road

Bucket in the well

Time period of a simple pendulum depends upon.

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Thickness of the thread

Mass of the pendulum

Length of the pendulum

Amplitude of vibration

Which of the following is not an elastic collision

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A man jumps on a cart

A bullet embedded in a block

Colliding of two glass balls

Colliding of two tennis balls

The SI unit of spring constant is identical with that of.

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Force

Pressure

Surface tension

Loudness

A body is said to be in complete equilibiurm when

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It attains translational equilibrium

Vector sum of all the forces is zero

Vector sum of all the torques is zero

Vector sum of all the torque and forces is zero

In simple harmonic motion we have the conservation of.

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K.E.

P.E

Total energy

Electrical energy

The magnitude of the resultant of two equal forces is equal to either to the force What is the angle between the two forces

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0 ^o

120 ^o

60 ^o

180 ^o

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