Question # 1

While passing through the atmosphere total energy is reduced due to.

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scattering

Absorption

Reflection

All of these

The escape velocity from the earth's surface is

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1.2 km s-1

1.7 km s-1

10.2 km s-1

11.2 km s-1

Unit vector of a vector A describes

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Magnitude of a given vector

Direction of given vector

Shape of a given vector

Magnitude and direction of a given vector

Angular frequency time period and frequency in SHM do not depend upon.

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Mass

Force constant

Amplitude

All of these

the consumption of energy by a 60 watt bulb in 2 s is

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0.02 J

30 J

120 J

60 J

If two non zero vectors are perpendicular to each other then their scalar product is equal to.

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-1

1

0

Infinity

If the dot product of two non zero vectors vanishes the vectors will be.

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any scalar quantity

Any negative number

Its magnitude but not direction

Its magnitude and direction

A neutron is in head on elastic collision with a stationary nitrogen nucleus The mass of nitrogen nucleus is 14 times that of a neutron The neutrons velocity after the collision is.

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Less in magnitude than its intimal velocity

Less in magnitude than the final velocity of the nitrogen atom

Equal in magnitude to its initial velocity but in the opposite direction

Greater in magnitude than its initial velocity

The magnitude of the instantaneous velocity is called the.

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_Displacement

Speed

Acceleration

Length

A physical quantity which produces rotation in a body is called.

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Force

Torque

Momentum

accelerate

The SI unit of solid angle is

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Degree

Radian

Steradian

Candala

Which one of the following does not have the same dimenstions.

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Energy ,work, heat

Pressure, stress, Young's modulus

Voltage, electromotive force, potential difference

Electric flux, electric field, electric dipole moment

Distance covered by a freely failing body in 2 s will be.

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19.6 m

4.m

39.2 m

44.1 m

The ratio of inertial mass to gravitational mass is.

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1

0.5

2

3

If the earth stopped rotating the weight of objects at either pole would.

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Be grater

Be less

Vary with altitude

Be the same before

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

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Straight line

Parabola

Hyperbola

zig zag

If the average velocity of an object is zero in some time internal the displacement of the object for that intercanal will be.

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Infinite

zero

Increase

Decreasing

In a projectile motion, the horizontal range depends upon.

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Initial velocity

Velocity at the highest position

angel of projection

Vertical component of velocity

The field in which the work done is independent of the path followed.

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Conservative field

Electric field

Magnetic field

Non conservative field

A man in an elevator descending with an acceleration will conclude that his weight has

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Increased

Decreased

Constant value

Zero value

When an arrow is shot from a bow, it has K.E. which is given to it by

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The elongated tail

The stretched string of bow

The throw of archer

The sharp arrows head

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