Question # 1

The magnitude of the resultant of two forces may be increased by

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Increasing the angle between them

Decreasing the angle between them

Drawing the parallelogram to represent them

Drawing the force perpendicularly

A body attached to a spring is pulled to a distance of 20 cm If the value of spring constant is 48 N m-1, the amount of force applied will be.

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4.8 N

9.6 N

96 N

192 N

Which of the following is a unit of electric field strength.

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c m-1

v m-2

N C-1

N V-1

Rate of change of momentum is called.

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Torque

Force

Impulse

Inertia

A bus and a car moving with the same K.E. are acted upon by the same retarding force then the

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car will stop first

Bus will stop first

Both will stop simultaneously

Both will never stop

The magnitude of resultant of three force is 3. If its x-component is 2, Y component is 1. Its 2-component will be.

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1

2

3

4

The static friction is.

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Always equal to dynamic friction

Always less than dynamic friction

Always greater than dynamic friction

Sometimes greater and sometimes less than dynamic friction

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

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

Two forces act together on an object the magnitude of their resultant force is minimum when they act at

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0 ^o

45^oC

90^o

180 ^o

Which base units would be needed to express the SI unit of potential difference.

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Kg and A only

m , s and A

kg, m, s and A

mg, m and s

The SI unit of torque is

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kg ms-2

kg m2s-2

kg ms-1

kg m2 s-3

A force of 20 N is applied on an elastic spring if the extension produced in the springs to cm, the value of spring constant.

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2 Nm-1

20 N m-1

200 N m-1

2,000 N m-1

Which of the following type of force can do no work on the particle on which it operates.

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Gravitational force

Frictional force

Centripetal force

Elastic force

Which of the following quantity is zero about the centre of mass of baody.

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Mass

Acceleration

Moment

Angular momentum

What is the number of degree of freedom of an oscillating simple gravity pendulum

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1

2

3

4

A mason of 9.8 N weight is climbing on a 20 m high ladder The P.E. of mason at the middle of the ladder is.

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98 J

196 J

960 .4 J

1920 .8 J

Candela is the SI base unit of.

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illuminance

Luminous flux

Luminous intensity

Radiant energy

A body of mass 2 kg attached to a spring is pulled to a distance of 4 cm What will be the value of spring constant K.

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490 N m-1

980 N m-1

1260 N m-1

1960- N m-1

The angle subtended at the centre of a circle by an arc equal to its radius is equal to.

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One rotation

One radian

One degree

One revolution

The unit formed by combining the fundamental untis of length , mass and time.

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Absolute units

Practical units

Bse unit

Derived units

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