Question # 1

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

Cathode ray oscilloscope works by deflecting a beams

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Neutrons

Protons

Electrons

Positron

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

In nuclear radiation , track of alpha particle is.

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Thin

Discontinuous

Erratic

Continuous

Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

The number of Isotopes of cesium are.

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4

32

22

36

Kx -Xrays are produced due to transition of electron from.

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K to L shell

L to K shell

M to K shell

M to L shell

Magnetic induction can be measured in units of.

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Tesla

Gauss

Weber/m2

All of the above

The dimensions of Plank's constant is same as that of.

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Energy

Power

Acceleration

Angular momentum

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

The mass of an object will be doubled at speed.

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2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

The SI unit of resistivity is.

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Ohm m-2

Ohm m-1

Ohm m

Ohm

The number of neutron present in a nucleus in a given by

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N = A+Z

N = A- z

N = Z - A

N = A X Z

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