Question # 1

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

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X-rays

Ultraviolet rays

y-rays

Cosmic rays

The electric field due to an infinite long thin wire at a distance R varies as

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1/R

1/R²

R

R²

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

When two objects are rubbed together, their internal energy

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remains same

decreases

remains the same then decreases

increases

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

The energy stored in a charge capacitor

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1/2CV²

1/2C²V

1/2C/V²

None of these

A labourer carrying a distance a load on his head moves from rest on a horizontal road to another point where he comes to rest. He has done:`

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Minimum work

Maximum work

Zero work

Negative work

For normal operation of transistor, the batteries

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V_CCis of much lower value than V_BB

V_CCis of much higher value than V_BB

V_{CC is equal to}V_BB

none of these

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

The concept of direction and position are purely

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absolute

relative

absolute or relative

none of these

The smallest three dimensional basic structure is called as:

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An atom

Unit cell

Crystal lattice

Polymer

None of these

In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be:

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25 Hz

70.7 Hz

50 Hz

100 Hz

When a horse pulls a cart the force that helps the horse to move forward is the force exerted by

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The cart on the horse

The ground on the horse

The ground on the cart

The horse on the ground

Length can not be measured by

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Fermi

Debye

Micron

Light year

Bulk modulus for ice is

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5

6

7

8

We can observe only when the grating spacing is

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of the order of the wavelength used

greater than the wavelength used

less than the wavelength used

any one of them

When an image is placed at the focal length of the eye piece, the final image formed at

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2 F

4 F

6 F

Infinity

A typical diffraction grating has lines per centimeter

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10 to 100

100 to 1000

1000 to 5000

400 to 5000

The path followed by a ballistic missile is called

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parabolic trajectory

ballisitic trajectory

both of them

none of them

The specific resistance of a wire varies with its:

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Length

Cross-section

Mass

Material

A ray of light reflected from a dense medium under goes a phase change of:

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30°

60°

90°

180°

Multimode step index fibre is useful for

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short distance

long distance

both a and b

none of them

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