Question # 1

Photo diode detects.

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Visible light

Radio waves

X rays

All of them

106 electrons are moving through a wire per second the current developed is:

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1.6 x 10-19 A

1 A

1.6 x 10-13A

106 A

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

Magnetic flux density at a point due to current carrying coil is determined by

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Ampere's law

Faraday's law

Lenz's law

Gauss's law

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

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

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Electron

Proton

β particle

All

The 1^st Bohr atom in the hydrogen atom has radius

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3.56 x 10^-10 m

0.053 x 10^-11 m

0.53 x 10^-11 m

5.30 x 10^-11 m

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

Both xenon and caesium each have:

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41 isotopes

36 isotopes

43 isotopes

33 isotopes

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

The maximum kinetic energy of emitted photo electrons depends upon.

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The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

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

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

The P.D develop in case of germanium is:

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0.3

0.7

0.5

0.9

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

The resistivity of two wires isρ₁ andρ₂ which are connected in series. If there dimentions are same then the equivalent resistivity of the combination will be:

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(ρ₁ +ρ₂)

1/ρ₁+ 1/ρ₂

ρ₁+ρ₂/2

ρ_1/ρ₂

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

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