Question # 1

The resistance of an incandescent lamp is

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Smaller when switched on

Greater when switched off

The same whether it is switch off or switch on

Greater when switched on

Back emf is produced due to

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Self induction

Mutual induction

A.C

Lenz's law

Bernoulli's equation is important in the field of

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Electrical circuit

Magnetism

Photoelectric effect

Flow of fluids

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

Vibratory, chord

SHM, diameter

SHM, circumference

A typical rocket ejects the burnt gases at speeds over

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400 ms^-1

40000m s^-1

40000 ms^-1

60000 ms^-1

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

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200 J

100 J

1000 J

400 J

The work done in moving a body between two points in a conservative field is independent of the

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Direction

Force applied

Path followed by the body

Power

Generally a temperature scale is established by using certain physical properties of a material which varies

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nonlinearly with temperature

linearly with temperature

either of them

none of them

The time period of pendulums of different lengths would be

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same

different

both of them

none of them

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

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2 : 1

4 : 1

1 : 4

3 : 4

For a quantity to be a vector it must has/have

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Magnitude and direction

Obey law of vector addition

Both (a) and (b)

Only (a)

If the cover of a red book is observed in monochromatic blue light,It will appear

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White

Red

Black

Blue

Is it possible to add a vector quantity to a scalar quantity ?

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No

Yes

Never

None of these

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

In multi-mode step index optical fibre, that layer is called cladding which has

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higher refractive index

lower refractive index

both of them

none of them

When seen in green light the saffron and green portions of our National Flag will appear to be

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Black

Black and green respectively

Green

Green and yellow respectively

If a body has zero acceleration, it means that it is

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At rest

Uniform velocity

Both

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.

A wire of 100 mm length and 1 mm²surface area stretches 10 mm under a load of 60 N. A second wire of same material, with half the diameter of the first wire is stretched by the same load. What is the extension in the second wire?

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20 mm

30 mm

40 mm

50 mm

The matter and energy are equivalent, was proposed by

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Newton

Einstein

Maxwell

None of these

Rectangular components are those which are

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Right angle to each other

Making angle of 90^O with each other

Perpendicular to each other

All of these

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