Question # 1

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic feild

Constant electric field

None of these

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

The portion of the water above its mean level forms a:

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Crest

Trough

Both A and B

None of these

The Stephen-Boltzmann law for the black body radiation is given by

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E = T²

E = -T²

E = T⁴

E = -T⁴

Above a certain velocity of a fluid is called

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turbulent flow

steady flow

either of them

both of them

In describing functions of digital systems, a closed switch will be shown as

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0

1

low

any one of these

We can express the work in term of

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directly measurable variables

indirectly measurable variables

either of them

both of them

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

The bicycle pump provides a good example of

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first law of thermodynamics

second law of thermodynamics

third law of thermodynamics

none of them

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

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Double

Remains constant

Half

None of these

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

An average energy used by the car-from petrol in its life time

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1 × 10⁹ J

1 × 10¹⁰ J

1 × 10¹¹ J

1 × 10¹² J

'S' is the arc length and after one revolution it becomes

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2π

2π/r

2πr

None of these

The blending of light when it passes from one medium to another is known as:

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Refraction

Interfarance

Polarization

Both (B) and (C)

In an interference fringes pattern the fringes are

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Equally spaced

Wider near the centre and narrower away from it

Narrower near the centre and wider away from it

None of these

A 120 m long train is moving in a direction with speed 20 m/s.A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

In a astronomical telescope the final image for normal vision is formed at

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The focal of the eye piece

The least distance of the distinct vision

The focus of the objective lens

Infinity

Optic fibers are related with

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Communication

Light

Computer

None of these

2 d sin θ = nλ can be used to determine the

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Inter planar spacing

Wavelength

Incident angle

All of these

Curie is the unit of

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decay constant

activity

half-life

average life

Ordinary light has components of vibrations in

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one direction only

two directions

four directions

all directions

The Hook's law defines

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Modulus of elasticity

Stress

Strain

Elastic limit

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