Question # 1

The spectrum emitted from hydrogen filled discharge tube is:

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Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

A massive object falls through a fluid:

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Faster

Slower

Slowest

None

Magnetic flux passing through the an element of are A placed perpendicular to a uniform magnetic field Bis:

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Maximum

Minimum

Zero

Very small

None of these

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

Referring to above figure, current in the coil P grows from zero to its maximum value:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

All of above

Neither of above

transverse wave motion is possible in:

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Air

A mixture of NH₃and O₂

Strings

All of these

The second law of thermodynamics is concerned with the circumstances in which

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heat can be converted into work

direction of flow of heat

none of them

both of them

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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2

1

0.5

1.5

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

If two forces of magnitudes 3.5 and 2.5 N act on a body such that the angle between the forces is zero, then magnitude of the resultant will be:

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1.0 N

6 N

3.5 N

12 N

The dimensions of work

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[MLT^-1]

[MLT^-2]

[ML²T^-2]

[MLT]

A spinning cricket ball suffers

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An extra height

An extra velocity

An extra curvature

None of these

A telescope has an objective of focal length 10 cm the magnifying power of telescope is 5.Its length in normal adjustment is

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7.5cm

10.5 cm

12 cm

15 cm

The range of projectile is 50 m when θ is inclined with horizontal at 15° what is the range when θ becomes 45°?

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400 m

300 m

200 m

100 m

The quantity F x t is called as

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momentum

velocity

acceleration

impulse

Which is having minimum wavelength?

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X-rays

Ultra-violet rays

Y-rays

Cosmic rays

A body is dropped from a tower reaches the earth surface in 4 sec where g is 10 m/s²the height of tower is

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80 m

20 m

160 m

40 m

A line normal to the wave front is called

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A beam of light

A ray of light

Both

None of these

For glass-air boundary the critical angle θ_c is

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30^o

41.8^o

42.0^o

44.0^o

Energy required to accelerate a car from 10 ms^-1to 20 ms^-1compared with that required to accelerate from 0 to 10 ms^-1is

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Twice

Three times

Four times

Same

In the absence of any force acting on a body

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its momentum changes with distance

its momentum is conserved

its momentum is not conserved

its momentum changes with time

Two particles of equal masses are revolving in circular paths of radii r₁ and r₂respectively with the same speed The ratio of their centripetal force

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r₂/r₁

√(r₂/r₁)

(r₂/r₁)

(r₂/r₁)²

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