Question # 1

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

A body of mass 2 kg is thrown up vertically with K.E. of 490 joules. If the acceleration due to gravity is 9.8 m/s², the height at which the K.E, of the body becomes half its original value is given by:

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50 m

12.5 m

25 m

10 m

Surface tension of water is due to

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Inter molecular attractions

Intermolecular spaces

Inter molecular repulsion

None of above

In a simple harmonic motion the kinetic energy (KE) and the potential energy (PE), are such that throughout the motion

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KE remains constant

PE remains constant

KE/PE is constant

KE+PE remains constant

At 0°K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

At constant volume temperature is increased. Then

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Collision on walls will be less

Number of collisions per unit time will increase

Collisions will be in straight lines

Collisions will not change

A moving charge will gain energy due to the application of

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Electric field

Magnetic field

Both of these

None of these

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3N. The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

A sun rise or sun set, the sun looks reddish because:

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

How does the Young's modulus vary with the increase of temperature?

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Decrease

Increases

Remains constant

First increases and then decreases

When the length of a microscope tube increases, its magnifying power

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Decreases

Increases

May increases or decreases depending on the observer and the place of observation

Does not change

A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is

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Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an a.c. supply of 20 V, 50 Hz. The secondary will have an output of

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200V, 50 Hz

2V, 50 Hz

200V, 500 Hz

2V, 5 Hz

A force of 10N is acting along y-axis. Its component along x-axis is

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10N

20N

100N

Zero N

In an L-R circuit, time constant is that time in which current grows from zero to the value

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0.63 I_o

0.50 I_o

0.37 I_o

I_o

A bullet is shot from a rifle. As a result the rifle recoils. The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

An object is placed at a distance of f/2 from a convex lens. The image will be

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At one of the foci, virtual and double its size

At, 3f/2, real and inverted

At 2f, virtual and erect

At f, real and inverted

The essential distinction between X-rays andγ-rays is that

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γ-rays have smaller wavelength than X-rays

γ-rays emanate from nucleus while X-rays emanate from outer part of the atom

γ-rays have greater ionizing power than X-rays

γ-rays are more penetrating than X-rays

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

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