Question # 1

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

When a nucleus emits an alpha particles, its charge number decreases by

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3

2

6

5

When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

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In the backward direction on the front wheel and in the forward direction on the rear wheel

In the forwards directions on the front wheel and in the backward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

For a parallel resonant circuit at resonance, current from supply is

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minimum

maximum

zero

none of these

If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have

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different values

same values

zero valves

constant valves

Strength of magnetic field is measured in SI units, in:

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N

N/Am

Am/N

Nm/A

None of these

When a conductor moved with its length parallel to the lines of magnetic fled:

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An emf is induced across its ends

Emf induced is similar to that of a battery

Emf passes through the conductor

Both A and B

None of these

With age, least distance of distinct vision:

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Increases

Decreases

Is not affected

None is correct

The un-steady streamline flow is called

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laminar flow

turbulent flow

both of them

none of them

At O° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

Fire fighters have a jet attached to the head of their water pipes in order to head of their water pipes in order to

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Increase the mass of water flowing per second

Avoid wastage of water

Increase the velocity of water flowing out

Increase the volume of water flowing per second

In case of mechanical waves, we study the motion of

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a single particle

collection of particle

any one of them

none of them

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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5.07 pF

50 pF

0.507 pF

507 pF

If one end of a rubber cord is fixed with a support and the other end is wiggled by hand, the waves generated on the card are:

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Stationary waves

Transverse waves

Both of these

None of these

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

Alternating current is produced by a voltage source which polarity:

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Remains the same

Reverse after period T

Keeps on reversing with time

Reverse after every time interval T/2

Both (C) and (D)

The fluid is incompressible, if itsdensity is

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zero

constant

very high

very small

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

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Refraction

Reflection

Diffraction

Formation of spectrum

Free oscillations are always produced by:

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An applied force

Gravitational force

Restoring force and inertia

Inertia only

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

Recent studies of ferromagnetism have shown that there exists in ferromagnetic substances small regions called

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tiny regions

domains

vectors

none of them

The force exerted by the fluid in a hydraulic pump on the piston is 10 cm², the fluid pressure on the piston is, in N/cm²

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20

200

2000

20,000

The third band of the colour code:

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Gives the number of zeroes

Is decimal multiplier

Gives the resistance tolerance

Gives the third digit

Both (A) and (B)

As the light shines on the metal surface, the electrons are ejected

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slowly

instantaneously

either of these

none of these

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

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second law thermodynamics

first law of thermodynamics

third law of thermodynamics

none of them

Pair production is the phenomenon in which

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matter is converted into energy

energy is converted into matter

light is converted into electrical energy

electrical energy is converted into light

The strength of magnetic field at certain points around a wire depends upon:

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Value of current passing

Distance from the current element

Color of the material

Both (A) and (B)

Both (B) and (C)

A choke coil is used as a resistance in

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d.c. circuit

a.c. circuit

d.c. potentiometer circuit

wheatstone bridge

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