Question # 1

X-rays travel with

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The speed of light

The speed of sound

The speed of 3,000 m s-1

The speed of 3,500 m s-1

Which of the following refers to the distance from crest to crest of a wave.

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Frequency

Wavelength

Amplitude

Period

92.65 is round off as

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92.6

93.00

92.7

None of these

What is the period of geostationary satellite.

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6 hours

12 hours

18 hours

24 hours

For the normal operation of transistor the emitter base junction is always.

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Zero biased

Reverse biased

Forward bised

Both a and b

The value of 'g' is affected by earth's

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Non spherical shape

Daily motion

Volume

Density

For an electron or position the rest mass energy is equal to.

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

Which two terminal passive electronic component implements electrical resistance as a circuit element.

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Capacitor

Inductor

Resistor

Transformer

Cobalt -60 is a radioactive element with half life of 5.25 years. What fraction of the original sample will be left after 26 years.

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1/4

1/8

1/16

1/32

Which term best describes the nature of light from modern view point.

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Waves

Rays

Particles

Photons

A 100 kg box is pulled 10 m across a frictionless horizontal surface by a 50 N force The change in the P.E. of the box a

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0 J

2 J

20 J

50 J

A forward based p-n semiconductor diode is called.

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Photodiode

Photovoltaic cell

Amplifier

Ligh emitted diode

Mean life of a radioactive sample is 100 s its half life will be

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0.693 s

1 s

6.93 s

69.3 s

Which of the following is an electrostatic generator.

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Winshurst machines

Van de Graff generator

Electrophorus

All of the above

Which one of the following is not a dimensionless quantity.

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Radian

pi

Decibel

Force

What happens to Carnot efficiency if the source temperature increases.

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Decreases

Increases

Remain the same

Becomes zero

Electromagnetic waves are produced by

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Charge at rest

Accelerated changes

Heating a conductor

Electroplating

When a magnet is moved into the coil of wire there is a small reading on the galvanometer Which change would increase the size of the reading.

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Pushing in the S-pole

Pulling the magnet out

Unwinding some of the turns of wire

Moving the magnet faster

The temperature which is the same in ^oC and ^oF is.

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-20

-40

20

40

If a fluid does not wet a liquid surface, the angle of contact is.

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90^o

less than 90 ^o

* greater than 180 ^o

between 90^o and 180 ^o

The process of pair production will take place if the energy of photon is greater than

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

An ideal engine can be 100% efficient only if its exhaust temperatute.

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Equal to input temperature

Less than is input temperature

More than its input temperature

0 ^oC

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

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Mass

Force constant

Amplitude

All of these

In a magnifying glass, the objective is placed at a distance

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Less than the focal

Between the focal length and twice the focal length

Greater than twice the focal length

At the focus of the lens

The pressure of a goas is directly proportion to

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Mean velocity of the molecules

Mean square velocity of the molecules

Root mean square velocity of the molecules

Instantaneous velocity of the molecules

A preset or trimmer can be a.

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Variable resistor

Variable capacitor

Variable inductor

All of these

Which Isotopes is use din radioactive dating.

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C¹²

C¹³

C¹⁴

C¹⁶

The absorption of X-rays in a given material follows.

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A parabola path

Is straight line

An exponential curve

A circle

Which law states that a change in the internal energy of a closed thermodynamic system is equal to the difference between the heat supplied to the system and teh amount of work by the system on the surrounding.

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Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

What is the number of degree of freedom of an oscillating simple gravity pendulum

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1

2

3

4

Which temperature is required for the fusion of two nuclides.

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10⁶ K

10⁷K

10⁸K

10 ⁹ K

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