Question # 1

Tick the series which lie/s in. the infra-red region.

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Pfund series

Brackett series

Paschen series

All of these

None of these

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet:

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Is smaller than

Is greater than

Becomes equal to

None of these

When quarter of a circle is completed, the phase of vibration is:

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90°

180°

45°

360°

An A.C varies as a function of

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Current

Voltage

Time

Charge

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

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Two

1/2

Zero

3/2

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

1 gm-cm^-3is equal to

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10³kg-m^-3

10^-3kg-m^-3

1kg-m^-3

10⁶kg-m^-1

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

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Zero

F/2

F

2F

While describing the motion of a simple pendulum, the frictional effects are

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taken into account

completely ignored

partially ignored

none of them

A wire can support a load W without breaking. It is cut into two equal parts. The maximum load that each part can support is:

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W/4

W/2

W

2 W

A unit vector is defined as

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Whose magnitude is one

Show the given direction

Opposite direction

a and b

The terminal velocity of a 2 cm radius ball in liquid is 20 cms^{-1. What would be the terminal velocity if the radius of the ball were halved? Keeping the mass constant}

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80 cms^-1

40 cms^-1

20 cms^-1

5 cms^-1

If we move from equator to pole,value of g

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Increases

Decreases

Remains same

First (A) and then (B)

The rate of change of angular momentum is

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The applied force

The moment of inertia

The applied torque

Impulse

A lens behaves as a converging lens in air and a diverging lens in water the refractive index of the material is

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Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

The critical temperature for mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

The time taken by the light to travel from Pluto to Earth is

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4 hrs 20 sec

5 hrs 20 sec

6 hrs 20 sec

76 hrs 20 sec

If both the length and radius of the wire are doubled,how does the modulus of elasticity change?

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Becomes one fourth

Halved

Doubled

Remains unchanged

1 kg mass of a substance is equivalent to the mass of

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1.1 x 10³⁰ electrons

11 x 10¹⁹ electrons

1.6 x 10³¹ electrons

9.1 x 10¹⁹ electrons

Which of the following theories of light are explained by the Young's double slit experiment?

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wave theory of light

particle nature of light

dual nature of light

corpuscular nature of light

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