Question # 1

The photoelectric effect, the maximum energy of photoelectrons depends on the

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particular metal surface

frequency of incident light

both of them

none of them

The number of input terminals of an op-amp is:

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One

Two

Three

Four

None of these

For a moving body, at any instant of time

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If the body is not moving the acceleration is necessarily zero

If the body is slowing, the retardation is negative

If the body is slowing, the distance is negative

If displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future

Potentiometer is more sensitive than voltmeter, because

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Voltmeter has a very high resistance

Voltmeter has a very low resistance

Potentiometer does not draw any current from a source of unknown potential difference

Potentiometer is sensitive

Practically the quantity v/c is always:

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less than one

Equal to one

Greater then one

all of these

None of these

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

In a moving coil galvanometer, the deflecting couple depends upon

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area of the coil

number of turns of coil

value of magnetic field

all of the above

A.C. can be measure with the help of

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Nuclear effect

Magnetic effect

Chemical effect

Heating effect

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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Smaller

Lerger

Same

Much larger

None of these

Conversion of alternating current into direct current is called

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amplification

rectification

conduction

polarization

If A x B = B x A,then the angle between A and B is

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π

π/3

π/2

π/4

A women of 50 kg distributes her wright equally over high-heeld shoes. Each heel has an area of 0.75 cm². The pressure exerted by each heel will be

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6.66 x 10⁶ Pa

3.33 x 10⁶ Pa

1.67 x 10⁶ Pa

3.33 x 10^-6 Pa

Energy per unit volume of a stretched wire is

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(1/2) x load x extension

Load x stress

Stress x strain

(1/2) x stress x strain

Shear modulus for copper is

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20

27

44

43

The resultant of two equal forces is double of either of the force.The angle between them is

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0°

60°

90°

120°

An elevator weighing 3.5 × 10⁶ N raised to a height of 100 m in the absence of friction the work done is

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3.5 × 10³ J

3.5 × 10⁴ J

3.5 × 10⁶ J

3.5 × 10⁹ J

If we go above the surface of earth equal to the radius of earth than value of g

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g

g/4

g/9

g/2

The magnitude of vector A,B and C are respectively 12,5 and 13 units and A + B = C then the angle between A and B is

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0

π

π/2

π/4

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

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1 x 10⁶ s

2 x 10⁶ s

2 x 10⁵ s

1 x 10⁵ s

The burnt gas expelled from the rocket engine with

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High velocity

Extremely high velocity

Very high velocity

None of these

In carnot cycle, there are isotherms as

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One

Two

Three

Four

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