Question # 1

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

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1 : 2

2 : 1

1 : 4

4 : 1

A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

The internal energy of an ideal gas system is generally the

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translational K.E of molecules

vibrational K.E of molecules

rotational K.E of molecules

all of them

The path described by a projectile is called its

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orbit

trajectory

range

distance

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

The special theory of relativity is based on:

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Four postulates

Three postulates

Two postulates

One postulate

None of these

When the magnitude of two component vectors are equal to that of their resultant, then the angle between the components is:

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60°

90°

120°

150°

Lenz's law is the consequence of

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Mass

Energy conservation

Momentum conservation

Charge

A stone is tied to the end of a 20 cm along string is whirled in a horizontal circle.

if centripetal acceleration is 9.8 m/sec², then its angular velocity in rad/sec is:

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22/7

7

14

21

With increase of temperature, the viscosity of liquid and gases

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Increases for both

Decreases for both

Increases for liquids and decreases for gases

Decreases for liquids and increases for gases

Time of flight of a body in projectile is the time in which a body

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Remains in the air

It reaches maximum height

The velocity becomes zero

None of these

A circular scale is attached and graduated in

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One degree

2 degrees

Half degree

None of these

When the first condition of equilibrium is satisfied the body will be in

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complete equilibrium

translational equilibrium

rotational equilibrium

all of them

Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as

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critical temperature

curie temperature

high temperature

fixed temperature

The siemens is the SI unit of

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Resistance

Specific Resistance

Conductance

Inductance

Huygen's wave front which sends out secondary wavelets with a speed equal to

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Speed of propagation of the wave

Speed of propagation greater than wave

Speed of propagation less than the wave

None of these

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

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

The path difference involved in interference in thin films depends upon

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Thickness and nature of thin films

Angular of incidence of light

Nature of media on both sides of thin film

All of these

In which of the optical fibres, the propagation of light signal is through continuous refraction?

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multi-mode step index fibre

multi-mode graded index fibre

both of them

none of them

Every point of a wavefront may be considered as a

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Source

Source of wavefront

Source of secondary wavefront

None of these

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