Question # 1

In an Isolated system , total energy of the vibrating's mass and spring is

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Low

High

Constant

Variable

Which of the following statement is correct for a particle moving in a horizontal circle with constant angular velocity.

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The linear momentum is constant but the K.E. varies

The K.E. is constant but the linear momentum varies

Both K.E. and linear momentum are constant

Both speed and linear velocity are constant.

A body is said to be in translations equilibrium, only if the vector sum of all the forces acting on it becomes.

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Double

Zero

Maximum

Quadruples

The SI unit of coefficient of viscosity of

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kg m s-1

kg m-1 s-1

kg ms -2

The SI unit of torque.

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kg m2

kg ms-2

kg m2 s-2

kg ms -1

Absolute P.E. of a body can be calculated

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At centre of the earth

Below centre of the earth

From surface of the earth

Below surface of the earth

An object moves 5.0 m north and then 3.0 m south . Find both the distance travelled and the magnitude of the displacement vector.

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2.0 m, 8.0 m

8.0 m, 2.0 m

8.0 m, 8.0 m

2.0 m, 2.0 m

Which of the following quantity has a unit that can be expressed in terms of just two different SI base units.

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Area

Change

Electric current

Length

The equal and opposite forces acting on a body form

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Angular momentum

Linear momentum

Torque

Couple

In an elastic collision

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K.E. is conserved

Both K.E. and momentum are conserved

K.E. is not conserved

Only momentum is conserved

The horizontal range is equal for the angles.

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30 ^o and 45 ^o

30 ^oand 60 ^o

45 ^o and 90 ^o

60 ^oand 75 ^o

If the K.E. of a body becomes four times of its initial value the new momentum will be.

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Half

Same

Four time

Double

A simple pendulum suspended from the celling of a lift has a time period T when the lift falls freely the time period of the pendulum will become

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Zero

T/9.8

9.8 T

Infinity

Periodic motion is a motion.

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Under the influence of an elastic restoring force

That repeats it self in equal intervals of time

Back and forth over the same path

With constant acceleration

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

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

In simple harmonic motion we have the conservation of.

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K.E.

P.E

Total energy

Electrical energy

Which of the following pair of physical quantities have the same dimension.

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Momentum and pressure

Energy and work

Linear and angular momentum

Force and surface tenstion

A body in equilibrium may not have

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Velocity

Momentum

Acceleration

K.E

A 10 kg rocket fragment falling towards the earth has a net downward acceleration of 5 ms -2 The net downward force acting on the fragment is

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5 N

10 N

50 N

105 N

When an unbalanced external force acts on a body for a short interval of time.

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The body will experience an impulse.

The momentum of the body increases

The velocity of the body increase

The body is not effected

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