Question # 1

In an electronic transition atom cannot emit

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Gama rays

Visible rays

Infrared rays

Ultraviolet rays

Some concept of static electricity were introduced by.

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Chinese

Plato

Thales

Archimedes

Solar cells are thin sand whishes of

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good conductors

Bad conductors

Semi conductor

Insulators

What happens to the energy of a charged condenser is plate separation is increased.

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It decreases

It increases

It becomes zero

It remains unchanged

A wave source of frequency 1,000 Hz emits waves of wavelength 0.1 m How long does it take for the waves to travel 2500 m.

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4 s

25 s

40 s

100 s

Photophone was invented by

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Graham bell

Galileo

Michelson

Faraday

Which animal did Erwin Schrodinger contemplate using in his famous thought experiment.

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mouse

Cat

Dog

Rabbit

If a gymnast sitting on a rotating stool with his arms out stretched lowers his arms.

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The angular speed increases

The angular speed decreased

The angular speed becomes zero

The angular speed becomes constant

When a fluid in a cylinder expands through a distance 'd' against a piston of area 'A' which is exerting a constant pressure 'P' the work done is equal by.

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PAD

PA/d

Pd/A

Pd/A2

Palaroids can be used

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To control headlight glare in right driving

To determine the concentration of the optically active substances

In curtain less windows to adjust the amount of light

all of the above

Low frequency response of an amplifier is mainly limited by.

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Biasing configuration

Coupling capacitor

By pass capacitor

Input impedance

In n-p-n transistor the current flows in the direction from

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Emitter to base

emitter to collector

Base to emitter

Base to collector

Which law states that the angle of incidence equals the angle of refraction.

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Law of reflection

Law of refraction

Snell's law

Hygens's principle

The ability's of convex lens to produce convergence in a parallel beam is called its.

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Magnification

Focal length

Power

Strength

the wavelength of continuous X-rays is inversely proportional to.

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Intensity of incident electron beam

Temperature of the target

Intensity of X-rays

The energy of electrons striking the target

In simple harmonic motion we have the conservation of.

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K.E.

P.E

Total energy

Electrical energy

Which are different types of emission spectrum

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Continues spectrum

Line spectrum

Band spectrum

all of the above

One calorie equals to

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1.2 J

2.2 J

3.2 J

4.2 J

Diffusion of gases occurs because the molecules of the

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Gas present in a higher concentration exerts a high pressure

Gases are different

Gasses attract each other

Gasses over about randomly

Which term is used for the persistence of sound in a hall.

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Resonance

Acoustics

Symphony

Reverberation

In a Nuclear reactor which material is often used as modeerator.

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Water

Graphite

Uranium

Water and graphite

The energy in an electromagnetic wave is carried in the units called.

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Protons

Electrons

Neutrons

Nucleus

In a stationary wave the particle velocity at the node is

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Zero

Constant

Minimum

Maximum

An active component of an electronic circuit consisting of a small block of semiconducting material to which at least three electrical contacts are made is known as.

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Rectifier

Amplifier

Thermocouple

Transistor

The phase angle between the voltage and current is A.C. circuit though a resistor is.

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0 ^o

45 ^o

90 ^o

180 ^o

How many calories of heat are required to evaporate completely 1 g or ice at 0^oC

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120 calories

520 calories

720 calories

920 calories

A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed.

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To increase the resistance of the circuit

To make it easier for the current to flow

To protect the wiring form overheating

To reduce the voltage across thelamp

The Lenz's law is also a statement of the law of conservation of.

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Energy

Mass

Momentum

Torque

Who was the first to suggest the existence of a positively charged nucleus in an atom.

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J.J Thomson

R.A Millikan

E.Rutherford

Neil Bohr

The ionization potential of hydrogen atom is.

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10.2 V

13.6 V

12.97 V

27.2 V

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