Question # 1

The electric heater takes a current of 4 A from a 250 V supply . How long would it take the heater to convert 400,000 J of electric energy.

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100 s

200 s

400 s

750 s

Which type of amplifier causes minimum drain of power supply.

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Class -A

Class -B

Class-C

Class -AB

The heat frequency is the

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Sum of the two frequenceis

Produce of the two frequency

Difference of the two frequencies

Ratio of the two frequencies

When a liquid is hated retaining its liquid sate then its molecules gain.

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K.E.

P.E

Heat energy

Chemical energy

Which of the following is used as a remedy for defect of hypermetropia.

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Convex lens

Concave lens

Cylindrical lens

Bifocal length lens

When an arrow is shot from a bow, it has K.E. which is given to it by

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The elongated tail

The stretched string of bow

The throw of archer

The sharp arrows head

Which Isotopes is use din radioactive dating.

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C¹²

C¹³

C¹⁴

C¹⁶

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

What kind of movement is dictated by the laws of thermodynamcis.

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Energy motion

Heat work

Light heat

Energy light

On what factor the internal energy of a thermodynamic system depend upon.

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History

State

Process

Surroundings

Bernouli's equation includes as a special case of.

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Hook's law

Torricelli's therorem

Third law of motion

Archimedes principle

Which of the following is a transport optical element with flat polished surfaces that refract light.

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Monocole

Axicon

Prism

Lens

In solid and liquids the variation of the speed of sound with temperature is.

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Much greater than in air

Slightly les than in air

The same as in air

Smell and usually negligible

A forward based p-n semiconductor diode is called.

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Photodiode

Photovoltaic cell

Amplifier

Ligh emitted diode

The gas thermometer is taken as the primary standard because.

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Thermometers are easily reproducible

Readings can be accurately taken

No correction are necessary

It produces he thermodynamic scale

Which one of the following has the largest wavelength.

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x rays

Infrared rays

Visible light

Radio waves

The ionization potential of hydrogen atom is.

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10.2 V

13.6 V

12.97 V

27.2 V

A single quantum of electromagnetic radiation is termed as.

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Compton

Photon

Hyperon

Meson

The point midway between the lens surface on its participial axis

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Optical centre

Principal focus

Focal plane

Focal length

Light rays after passing through is convex lens.

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Bend away from principal axis

Bend towards participial axis

Remain unriveted

Travel parallel to the principal axis

A semiconductor diode conducts only when it is

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Not biased

Zero biased

Reverse biased

Forward and biased

What is the traditional name for a capacitor

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Choke

Condenser

Transformer

Inductor

During solid ficain the temperature.

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Remains constant at the freezing point

Increases at the freezing point

Decreases at the freezing point

Decreases at the melting point

The SI unit of coefficient of viscosity of

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kg m s-1

kg m-1 s-1

kg ms -2

In which of the following controlled nuclear chain reaction is used to liberate energy.

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Nuclear bomb

Atomic bomb

Hydrogen bomb

Nuclear reactor

A body is thrown vertically upward with initial velocity 9.8 ms-1 it will reach the height.

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4.9 m

19.9 m

29.4 m

49.2 m

The electric supply line in houses works at 220 V what will be the amplitude of emf.

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120 V

331 V

220 V

440 V

The phenomenon of interference comes about because waves obey

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the impulse momentum theorem

An inverse square law of intensity

The principle of reciprocity

The principle of super position

The fundamental frequency of a sound source is 256 Hz. What is the frequency of the first harmonic.

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64

128

256

512

Angular acceleration is produced due to

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Centripetal force

Torque

Force

Mass

If the resultant of two forces, each of magnitude F have the magnitude F, angle between the forces will be.

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30^o

80^o

90 ^o

120 ^o

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