Question # 1

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

In CRO, the output waveform of time base generator is

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Circular

Square

Sinusoidal

Saw-toothed

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

Earth orbital speed is

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10 km/s

20 km/s

30 km/s

40 km/s

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

If the length of solenoid is doubled but N same, B inside the solenoid becomes.

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Half

Doubled

One fourth

Four times

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

The place for soring the nuclear waste is

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Ocean

Damping in earth

Damping in desert

Bottom of old salt mines

The device in the circuit that consume electrical energy are known as.

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Dissipaters

Generator

Load

Motors

The absolute electric potential at a point distance 20 cm from a charge of 2 uC is.

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9 x 10² V

9 x 10³ V

9 x 10⁴ V

9 x 10 ⁵ V

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

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