Question # 1

An A.C. voltmeter reads 220 V, its peak value will be

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225 V

240 V

311.12 V

300 V

The middle region of electric field is:

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Maximum field spot

Zero field spot

Perpendicular field spot

All of above

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

To convert a galvanometer into an ammeter, we connect with it a

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Shunt resistance

Low value parallel

Low value by pass resistor

All of above

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

Target material used in x-rays tube have following properties.

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High atomic number and high melting pouint

High atomic number and low melting pouint

Low atomic number and low melting pouint

High atomic number only

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

The "toner" of photocopier is given:

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Positive charge

Negative charge

Remains neutral

All of above

James chadwick discovered:

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Proton

Positron

Neutron

Electron

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

Einstein photoelectric equation is

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None of these

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

Phase difference between V and I of an A.C through resistor is.

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Zero Degree

90 ^o

80^o

120^o

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

Three resistors of resistance R each are combined in various ways, Which of the following cannot be obtained?

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3 RΩ

2R /4Ω

R/3Ω

2R /3Ω

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

Compton shift is maximum for scattering angle of photon

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0^o

90^o

180^o

45^o

Heat generated by a 40 W bulb in one hour is.

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140 J

1440 J

14400 J

144000 J

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