Question # 1

A body at rest may have

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Speed

Momentum

Acceleration

Energy

Which quantity has different units from the other three.

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Density x volume x velocity

Rate of change of momentum

Young's modulus x area

Weight

The SI unit of density is.

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kg m2

kg m-2

kg m-3

kg m2 s-2

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 rate of change of momentum of a body falling under gravity is equal to its.

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P.E.

K.E

Weight

Density

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

Linear acceleration of a point moving in a circle of radius 30 cm with angular acceleration of 0.5 rad s-2 is

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1.5 cm s-2

2.5 cm s-2

10 cm s-1

15 cm s-2

The work required to lift a ball of mass 'm' from the surface of the earth to an infinite distance is

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Absolute P.E. of the body

P.E of the body

K.E. of the body

Chemical energy of the body

The number 0.02 x 10^-8in standard form will be written as.

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2 x 10^-10

2 x 10^-8

20 x 10^-8

20 x 10^-6

If slope of velocity time graph gradually decreases, then a body is said to have

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Negative acceleration

Positive acceleration

Uniform velocity

Variable velocity

A body of mass 2 kg is suspended from the celling of an elevator moving up with an acceleration 'g' its apparent weight in the elevator will be.

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9.88 N

19.8 N

29.4 N

39. 2 N

In the case of forced oscillations frequency of oscillation is.

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The natural damped frequency

The natural undamped frequency

The frequency of the external periodic force

Some other frequency

If the presence of air friction, the path of a projectile appears as.

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Straight line

Parabola

Hyperbola

zig zag

A car is travelling with uniform acceleration the road has check posts every 100 m When the car passes one post , it has a speed of 10 m s-1 and when passes the next one its speed is 20 ms-1 What is the cars acceleration.

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0.67 m s-2

1.5 m s2

2.5 m s-2

6.0 m s-2

When speed of a moving body becomes double.

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Its K.E. is doubled

Its acceleration is doubled

Its P.E. is doubled

Its momentum is double

Which quantity has dimensions different from the others.

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Energy per unit volume

Force per unit area

Angular momentum per unit mass

Pressure

In rotational motion the quantity which plays the same role as the inertial mass in rectilinear motion.

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Angular momentum

Linear momentum

Moment of inertia

Torque

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

Which statement for geostationary orbit is false.

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A geostationary orbit must be directly above the equator

All satellites in a geostationary orbit must have the same mass

The period of a geostationary orbit must be 24 hours

There is only one possible radius for geostationary orbit

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

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Null vector

Position vector

Unit vector

Distance vector

The centre of gravity of a cylinder is.

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At the intersection of medians

At the centre

At the middle point of axis

At the intersection of diagonals

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