Question # 1

When a nucleus emits alpha particle its atomic mass decreases by

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1

2

3

4

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

Cobalt -60 is the source for

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Alpha rays

Gama rays

Beta rays

Neutron

A charged particle enters in a strong magnetic field its K.E.

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Remain constant

Increases

Decreases

Increases then decreases

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

Low level radiations effects

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Less of hair

Ulceration

Drop of white blood cells

All

1 amu is equal to

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1.0606 x 10^-27 kg

1.66 x 10^-31 kg

1.66 x 10^-34 kg

1.66 x 10^-19 kg

An electron enters the magnetic field at right angle from left, B is into paper. The electron will be deflected.

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upward

To ward right

Down ward

Toward left

The SI Unit of magnetic induction is.

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Weber

Tesla

Gauss

Newton

Kirchhoff's first rule is the manifestation of the law of conservation of.

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Mass

Charge

Energy

Momentum

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

By increasing the temperature of conductor, the flow rate of charges.

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Increase

Remains constant

Decreases

Changes exponentially

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

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

The Grid 'G' in cathode ray oscilloscope.

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Accelerate as well as focus electron beam

Control no. of electrons beam

Is at - Ve potential with respect to cathode.

Both d and b

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

The number of protons in any atom are always equal to the number of

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Neutrons

Electrons

Positrons

Mesoris

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

The quantity time constant RC has units of.

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Charge

Time

Capacitance

Resistance

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

Concept of electric field lines was given by:

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Michelson

Henry

Michael faraday

Oersted

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