Question # 1

The energy of photon for photoelectric effect is less than

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1 MeV

2 MeV

5 MeV

8 MeV

A cable breaks if stretched by more than 2mm. It is cut into two equal parts. How much either part can be stretched without breaking?

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25 m

1mm

2mm

0.5 m

The electric intensity due to two oppositely charged plates is

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None of these

The most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

In Wilson cloud chamber, ß-particles leave

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Thin and continuous tracks

Thick and continuous tracks

No tracks

Thin and discontinuous tracks

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

Tolerance of "Gold" band.

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±10%

±5%

±15%

±20%

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

The electrons in one coulomb change is equal to.

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1.6 x 10^-19

2.25 x 10^-19

6.25 x 10^-18

6.25 x 10^-19

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

Two metallic sphere of radius 2 cm and 4 cm get equal quantity of charge. Which has greater surface charge density ?

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2^nd sphere

Both have same

First sphere

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

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

The value of Rydberg constant is:

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1.0749x10⁷m^-1

1.0974 x 10⁷ m^-1

1.974 x10⁶m^-1

1.0974 x 10^-7 m^-1

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

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