Question # 1

Radio waves of constant amplitude can be generated with

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Rectifier

Filter

FET

Oscillator

The dimensional formula of toque is:

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[ML²T²]

[MLT²]

[ML^-1T^-2]

[ML^-2T^-2]

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

What will be the ratio of the distance moved by a freely falling body from rest in 4^th and 5^th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 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

A 50-volt battery is connected across 10-ohm resistor.The current is 4.5 A.The internal resistance of the battery is

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Zero

0.5 Ω

1.1 Ω

5.0 Ω

One cannot see through fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

In a capacitive circuit

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Current leads voltage by phase of π/2

Voltage leads current by phase of π/2

Current and voltage are in same phase

Sometime current and sometime voltage leads

Which quantity is increased in step-down transformer?

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Current

Voltage

Power

Frequency

A body moving in circular motion with constant speed has

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Constant velocity

Constant acceleration

Constant kinetic energy

Constant displacement

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