Question 1

The amount of energy lost by an alpha particle as it moves through a potential difference of 1V is

Accepted Answer

$3.2	imes10^{-19} J$

Answer

$1.6	imes 10^{-19} J$

Answer

zero

Answer

$6.4	imes 10^{-19} J$

Question 2

Gauss' Law can only be applied to a

Accepted Answer

closed surface

Answer

infinite surface

Answer

curved surface

Answer

flat surface

Question 3

A rectangular bar of iron is 2cm by 2cm in cross section and is 40 cm long. Calculate its resistance if the resistivity of iron is $11	imes 10^{-8}\Omega\ m $

Accepted Answer

$1.1	imes 10^{-4}\Omega $

Answer

$1.1	imes 10^{-8}\Omega $

Answer

$11	imes 10^{-4}\Omega $

Answer

$1.1	imes 10^{-6}\Omega $

Question 4

A thermistor converts changes in temperature into

Accepted Answer

electric voltage

Answer

light

Answer

sound

Answer

heat

Question 5

Heat generated by a 40 W heater in 1 hour is

Accepted Answer

144000J

Answer

14400J

Answer

144J

Answer

1440J

Question 6

Find the value of magnetic field that will cause a maximum force of $7.0	imes 10^{-3} N$ on a 20 cm straight wire carrying a current of 10.0 A.

Accepted Answer

$3.5	imes 10^{-3} T$

Answer

$3.4	imes 10^{-4} T$

Answer

$3	imes 10^{-4} T$

Answer

$3.5	imes 10^{-6} T$

Question 7

The negative sign with induced emf in Faraday’s Law is in accordance with:

Accepted Answer

Lenz's law

Answer

Boyle's Law

Answer

Ampere's Law

Answer

Gauss' Law

Question 8

The basic circuit element in a D.C circuit which controls the current and voltage is:

Accepted Answer

resistor

Answer

inductor

Answer

capacitor

Answer

transistor

Question 9

Find the value of current and inductive reactance when AC voltage of 220V at 50Hz is passed through an inductor of 10H.

Accepted Answer

0.07A

Answer

0.007A

Answer

1A

Answer

0.7A

Question 10

Glass and high steel carbon are examples of

Accepted Answer

brittle substances

Answer

ductile substances

Answer

soft subtances

Answer

hard substances

Question 11

Curie temperature of iron is about

Accepted Answer

1023K

Answer

750K

Answer

0K

Answer

330K

Question 12

The barrier potential of silicon diode at room temperature is

Accepted Answer

0.7V

Answer

0.5V

Answer

0.3V

Answer

0.1V

Question 13

The photon with energy greater than 1.02 MeV can interact with matter as

Accepted Answer

pair production

Answer

photoelectric effect

Answer

Annihilation of matter

Answer

Compton's effect

Question 14

A particle of mass  5mg moves with a speed of $8ms^{-1}$. Calculate its de Broglie wavelength.

Accepted Answer

$1.66	imes 10^{-29}m$

Answer

$12	imes 10^{3}m$

Answer

none

Answer

$3.2	imes 10^{-3}m$

Question 15

The Compton shift in wavelength will be maximum when scattering angle is

Accepted Answer

180 degrees

Answer

45 degrees

Answer

90 degrees

Answer

0 degrees

Question 16

Photons emitted in inner shell transitions are

Accepted Answer

characteristic X rays

Answer

continuous X rays

Answer

none

Answer

discontinuous X rays

Question 17

Automatic functioning of street lights can be done by use of

Accepted Answer

comparator

Answer

inductor

Answer

thermistor

Answer

capacitor

Question 18

An electron is placed in a box about the size of an atom that is about $1.0	imes 10^{-10} m$. What is the velocity of the electron?

Accepted Answer

$7.29	imes 10^{6} ms^{-1}$

Answer

$7	imes 10^{8} ms^{-1}$

Answer

$8	imes 10^{9} ms^{-1}$

Answer

$7.29	imes 10^{-6} ms^{-1}$

Question 19

The reciprocal of decay constant of a radioactive material is

Accepted Answer

mean life

Answer

none

Answer

partial life

Answer

half life

Question 20

The unit of $\sqrt (LC)$ is

Accepted Answer

second

Answer

farad

Answer

ampere

Answer

hertz

Question 21

Very weak magnetic fields produced by brain can be detected by

Accepted Answer

squids

Answer

compass

Answer

metallic needle

Answer

liquids

Question 22

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Accepted Answer

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