Question # 1

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

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

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

Work is a:

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Scalar quantity

Vector quantity

Base quantity

None of these

The velocity of sound is greatest in

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Water

Air

Vacuum

Metal

Average value of A.C voltage during one cycle is

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1

Zero

Maximum

Variable

A resistance used in voltmeter is called

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shunt resistance

high resistance

low resistance

zero resistance

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

Amplitude in SHM is equivalent to ______ in circular motion

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Diameter

Radius

Circumference

None of these

For a body executing S. H. M, its

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momentum remains constant

potential energy remains constant

kinetic energy remains constant

total energy remains constant

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

Wave length of that color as compared to that of violet color is:

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Smaller

Longer

Equal

None of these

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

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9.4 kHz

940 kHz

94 kHz

None of these

The L-C parallel circuit the capacitor draws a

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leading current

lagging current

main current

none of these

Area under the force displacement graph gives

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Power

Work

Heat

Energy

Which of the following is scalar quantity?

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Electric potential

Velocity

Momentum

Force

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

The unit of flux density is also given by

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Weber/m²or Wb . m^-2

Weber/mor Wb . m

Weber/mor Wb . m^-1

Weber or Wb

The critical temperature of mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

The SI units of momentum is

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kg m s^-2

kg ms

kg m s²

N-s

A potential barrier of 0.7V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

The phase at the positive peak of an A.C. cycle is:

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0º

90º

180º

0 andᏘ

Ꮨ/2 and 3Ꮨ/2

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

Michael Faraday and Joseph Henry belong respectively to

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USA and England

England and France

England and USA

USA and France

None of these

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

In the force applied is parallel to the direction of motion, then work done is:

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Maximum

Minimum

Zero

None of these

0.0001210 has ____________ significant figures.

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Four

Three

Seven

Eight

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