Question # 1

Brownian motion increases due to

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Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

Rate of diffusion is

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Faster in solids than in liquids and gases

Faster in liquids than in solids and gases

Equal to solids, liquids and gases

Faster in gases than in liquids and solids

Which of the following is scalar quantity?

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Electric potential

Velocity

Momentum

Force

In series RC circuit when R=X_c, then the phase angle is

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0°

90°

70°

45°

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

An example of photoconductor is:

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Boron

Carbon

Iron

Aluminum

Selenium

The CRO is used for displaying the waveform of a given

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current

voltage

both of them

none of them

Two sources of sound are said to be coherent if

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The produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase difference all instant of time

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

According to boyle's law, volume of a given mass of a gas is

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Inversely proportional mass at constant pressure

Directly proportional to pressure at constant temprerature

Inversely proportional pressure at constant temprature

None of these

For glass-air boundary the critical angle θ_c is

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30^o

41.8^o

42.0^o

44.0^o

The work done by stretching force is the area of

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Trapezium

Triangle

Rectangle

None of these

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

A substance containing equal no. of opposite charges separated by a small distance is known as

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Super conductor

LED

Dipole

Insulator

If speed of electron is 5 x 10⁵ m/s.How long does it take one electron to traverse 1 m?

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1 x 10⁶ s

2 x 10⁶ s

2 x 10⁵ s

1 x 10⁵ s

In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width

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Becomes doubled

Becomes 4 times

Is halved

Remains the same

A bullet train move with the velocity of

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400 Kmh^-1

460 Kmh^-1

500 Kmh^-1

510 Kmh^-1

Huygen's theory cannot explain:

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Diffraction

Interference

Polarization

Photoelectric effect

The forbidden energy band gaps in conductors semiconductors and EG,EG₂ and EG₃respectively The relation among them is

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EG₁ = EG₂ = EG₃

EG₁ < EG₂ < EG₃

EG₁ > EG₂ > EG₃

EG₁ < EG₂ > EG₃

The gravitational pull of earth on a mass of 20 kg on the surface of earth is

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20 N

196 N

19.6 N

1960 N

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