Question # 1

The nib of fountain pan is split of convey ink down the nib by the phenomenon of.

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Adhesion

Cohesion

Osmosis

Capillary

Since a diode permits the flow of current only in one direction so it can be used as.

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An oscillator

A rectifier

A phot deflector

A transistor

As a positively charged rod is brought closer and closer to a positively charged electroscope the gold leaf.

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diverges

Converges

is neutralized

Is unaffected

As a result of modulation, the resultant wave is called.

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Carrier wave

Modulated carrier wave

Matter wave

Energetic carrier wave

Which of the following devoices are used for measuring temperature.

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Thermocouples

Thermistors

Thermometers

All of these

Huygen's concept of secondary waves.

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Allow us to find the focal length of a thick lens

Is a geometrical method to find a wave front.

Is used to determine the velocity of light

Is used to explain polarization

the depth of a pond is 4 m What is the apparent depth of the pond if the water level is 3.5 m high. The refractive index of water is 1.33

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1.9 m

2.3 m

3.13 m

4.5 m

The typical value of forbidden energy gap in germinium is.

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0.7 eV

1.0 eV

1.4 eV

10 eV

A constant mass undergoes uniform acceleration the correct statement about the resultant force acting on the mass is.

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It increases uniformly w.r.t time

It is constant but not zero

It is proportional to the displacement from a fixed point

It is proportional to the verlocity

No current flows between two charged bodies when connected if they have same.

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Charge

Capacity

Potential

Shape

If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is

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5 A

10 A

12 A

15 A

Photo diodes are used as

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Optical fibre receivers

Automatic switching

Logic circuits

All of the above

The permeability of air is

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0.5

zero

infinity

Unity

Which of the following is SI base unit for temperature.

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Celsius

Kelvin

Fahrenheit

Rankine

Which of the following is heat transfer by means of the emission or absorption of electromagnetic radiation such as sunshine.

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Conduction or diffusion

Convection

Radiation

Mass transfer

In optics, which subfield studies the measurement of electromagnetic radiation including visible light.

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Radiometry

Photometry

Telemetry

Chronometry

The special theory of relativity was presented by

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Albert Einstein

Newton

Maxwell

Planck

The resistance offered by one cubic meter of a substance is known as.

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Reactance

Conductance

Conductivity

Resistivity

Which of the following quantities is not changed during refraction of light.

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Its direction

Its speed

Its frequency

Its wavelength

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 maximum K.E. with which photoelectrons are emitted depends very strongly on the.

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Intensity of incident light

Electric field near the photocathode

Frequency of incident light

Polarization of incident light

What is the properly of materials that responds at an atomic or subatomic level to an applied magnetic field.

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Magnetism

electroplating

Diamagnetism

Electrolysis

Lenz's was a physicist of.

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America

Russia

Japan

China

The mechanical equivalent of heat is.

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Physical quantity

Constant

Conversion factor

Zero

The magnetic induction is also called the

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Magnetic intensity

Magnetic flux

Magnetic flux density

Magnetic magnetization

A spring of force constant k is out into three equal pats. The force constant of earth part will b e.

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k

3 k

k/3

k/2

Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.

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20 minutes

40 minutes

80 minutes

120 minutes

The speed of the charging or discharging a capacitor depends upon the product of resistance and.

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Current

Voltage

Capacitance

Potential difference

48 days after the receipt the amount of iodine -131 left behind is only.

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0.1325 g

0.2135 g

0.3125 g

0.1235 g

In Compton's effect the change in wavelength of a scattered photon is called.

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Angle of emergence

Angle of refraction

Angle of deviation

Compton shift

In annitilation of matter, positron and electron pair disappears into two

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Alpha particles

Beta particles

Game particles

X-rays

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