Question # 1

The scalar product of two vectors in negative when

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Vectors are parallel

Vectors are antiparallel

Vectors and perpendicular

Vectors are parallel with same magnitude

The ratio of inertial mass to gravitational mass is.

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1

0.5

2

3

A rocket propulsion is based on the principle of.

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Conservation of momentum

Conservation of mass

Conservation of energy

Floatation

The term radius of gyration relates to.

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Moment of force

Moment of inertia

Law of gravitation

simple harmonic motion

A body of mass 3 kg lies on the surface of the table 2 m high it is moved on the surface 4 m the change in P.E. will be.

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9.8 J

6 J

Zero

329 J

The centre of mass of a system is a point where an applied force causes the system to move.

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With rotation

Without rotation

Fastly

Slowly

Which of the following quantities associated with SHM does not vary periodically.

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velocity

Displacement

Acceleration

Total energy

The SI unit of momentum is.

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kg m s-2

kg m2 s-2

kg m s-1

kg s-1

If the resultant of all the forces acting on a body is zero then the body is in

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Translation equilibrium

Rotational equilibrium

Equilibrium

Dynamic equilibrium

Impulse is equal to.

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F x t/2

\F x t /4

F x t

F x t /m

Which of the following is not necessary for work to be done.

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A constant force

An applied force

A displacement

Force component along the displacement

The relation between horse power and watt is.

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1 hp = 546 watts

1 hp = 746 watts

1 hp = 946 watts

1 hp = 1000 watts

The process where by energy is dissipated from the oscillating system is called.

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Resonance

Damping

Forced oscillation

Free oscillation

In the absence of air resistance all objects regardless their weights, fall with

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Same velocity

Different velocity

Same acceleration

Different acceleration

By decreasing angle between two vectors their cross product.

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Increases

Decreases

Remains the same

Vanishes

A body is thrown vertically upward with initial velocity 9.8 ms-1 it will reach the height.

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4.9 m

19.9 m

29.4 m

49.2 m

An astronaut in an earth satellite will observe the sky as

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Light blue

Deep blue

White

Black

The centre of gravity of an object is also called.

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Centre of buoyancy

Centre of mass

Centre of the body

Torque

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 condition of complete equilibrium is satisfied if.

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Vector sum of all the torques is zero

Vector sum of all the forces is zero

Vector sum of all the forces and torques is zero

Angular acceleration is zero

The moment of inertia of a body comes in action in

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Circular motion

Straight line motion

Curved path

zig zag motion

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