Question # 1

Which of the following is not an example of adiabatic process

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the rapid escape of air from a burst type

the rapid expansion and compression of air through which a sound wave is passing

cloud formation in the atmosphere

none of them

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

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Equal to

Greater than

Smaller than

None of these

If water in a closed bottle is taken up to the moon and opened, the water gets

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Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

Computer chips are made from:

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Iron

Silicon

Helium

Stontium

Aluminium

The free electrons in metals:

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Are in random motion and their speed depends upon temperature

Move in particular direction

Move with speed of light

Move such that their speed does not depend on their temperature

None of these

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

Xerography means:

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Dry writing

Wet writing

Poor writing

Excellent writing

Both (A) and (B)

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

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0 J

2 J

5 J

10 J

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

A relationship between Gauses of magnetic induction and Tesla(T) is given by

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G 10^-3T

G = 10^-2T

G = 10^-4T

G = 10^-1T

Angular momentum is a:

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vector quantity

Imaginary quantity

Complex Quantity

Scalar Quantity

The whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polysterne

None of these

An LED emits light when it is:

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Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

A stone tied to the end of a 20 cm long string is whirled in a horizontal circle. If centripetal acceleration is 9.8 m/sec², then its angular velocity is rad/sec is:

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22/7

7

14

21

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

A body with frequency would complete one vibration in:

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f seconds

1/f seconds

1 second

f²second

A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?

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10 A

5 A

33.3 A

3.33 A

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

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5

0.5

0.005

50

What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?

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10^-1A

10^-2A

10^-4A

1 mA

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

A current carrying conductor sets up its own:

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Electric field

Nuclear field

Magnetic field

Both (A) and (C)

All of these

Which of the following medium/media can transmit both transverse and longitudinal waves:

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Solids

Liquids

Gases

All of them

If a given spring of spring constant K is cut into two identical segments, the spring constant of each segment is:

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K/2

2 K

4 K

None of these

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

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100 K

273 K

0 K

-273 K

The mass of an object will be doubled at speed

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1.6 x 10⁸ms^-1

2.6 X 10⁸ms^-1

2.6 x 10⁷ms^-1

2.6 x 10⁹ms^-1

Diameter of the nucleus s of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

In the region surrounding a current carrying wire:

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A magnetic field is setup

The lines of force are elliptical

Direction of lines of forces depends upon direction of current

Both (A) and (C)

All of these

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