Question # 1

Two sources of sound are said to be coherent if

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The produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase difference all instant of time

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

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300°C

573°C

600°C

743°C

0.0001210 has ____________ significant figures.

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Four

Three

Seven

Eight

The irregular and unsteady flow of the fluid is called

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turbulent flow

steady flow

either of them

both of them

A particle is moving along a circular path with uniform speed. Its projection will execute____along the____of the circle:

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Circular motion, circumference

Vibrator, chord

SHM, diameter

SHM, circumference

X-rays can penetrate in a solid matte through a distance of several:

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Kilo metres

Metres

Centimeters

A few angstroms

One micrometer

If every particle of the flow that passes a particular point, moves along the same path as followed by particles which passed the point earlier, then this flow is said to be

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turbulent

streamline

abrupt

none of them

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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number of photoelectrons

size of the photoelectrons

charge on photoelectrons

K.E of photoelectrons

Resistance is measured in

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volts

ampere

ohm

watt

Which of the following waves are more energetic

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radio waves

infrared waves

ultraviolet

γ-rays

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

Petrol engine coverts ____________ of available heat energy into work.

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20% to 25%

25% to 30%

30% to 35%

35% to 40%

If the angle between r and F is 90°, then the torque is

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zero

minimum

maximum

infinite

When crest of one wave falls on the crest of the other wave. This phenomenon is known as:

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Destructive interference

Diffraction

Polarization

Constructive interference

The forbidden energy band gaps in conductors semiconductors and EG,EG₂ and EG₃respectively The relation among them is

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EG₁ = EG₂ = EG₃

EG₁ < EG₂ < EG₃

EG₁ > EG₂ > EG₃

EG₁ < EG₂ > EG₃

The uniformly accelerated equations are useful only for

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Angular motion

Curved motion

Linear motion

None of these

Coulomb's force is also

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Single force

Mutual force

Self force

None of these

When torque acting on a system is zero which of the following is constant

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Force

Impulse

Angular momentum

Inertia

The minimum number of unequal forces whose vector sum can be zero is

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3

2

1

4

Using monochromatic light, interference fringes are produced on a screen placed a distance D from a pair of slits of separation a.

The separation of the fringes is X.

a is now halved and D is increased by a factor of 4.

What is the new fringe separation?

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16 X

8 X

4 X

2 X

The rate of change of angular momentum is

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The applied force

The moment of inertia

The applied torque

Impulse

The lower refractive index the fibre core has

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1.48

1.40

1.54

1.42

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