Question # 1

If V_rms be the root mean square value of emf then its peak to peak value is given by

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The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

An inductor of 1 henry inductance has a reactance 500 ohms, then the frequency required is approximately

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50 Hz

100 Hz

80 Hz

120 Hz

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

Force per unit charge is called:

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Gravitational force

Electric field intensity

Coulomb's force

None of these

In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.

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90^oC

Zero

120^oC

45^oC

The first superconductor was discovered in:

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1831

1911

1921

1876

The existence of positron in 1928 was predicted by

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Anderson

Dirac

Chadwick

Plank

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:

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1:2

2:1

1:3

4:3

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

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0.2 henry

0.1 henry

0.8 henry

0.04 henry

The position has charge which is in magnitude equal to the charge on

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Electron

Proton

β particle

All

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

Charge on electron is

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1.6 x 10^-19 C

1.6 x 10¹⁹C

1.6 x 10^-17C

1.6 x 10¹⁷C

A rheostat can be used as variable resistor as well as a-------------

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Potential divider

Current divider

Wheat stone bridge

Power divider

Electric field intensity at a point is defined by the relation.

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E= q/F

E = F/q

E = qF

E = F/q2

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

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