Full Book

1

Which device converts electrical energy into mechanical energy?

A Generator B Transformer C Electric motor D CRO

2

A transistor is mainly used for:

A Rectification B Amplification C Heating D Lighting

3

The electrical conductivity of a semiconductor lies between:

A Conductors and insulators B Only conductors C Only insulators D Superconductors

4

Which quantity remains constant when light travels from air into glass?

A Speed B Wavelength C Frequency D Direction

5

Which quantity remains constant in an ideal transformer?

A Voltage B Current C Power D Resistance

6

Increasing the number of turns in a coil will:

A Decrease induced emf B Have no effect C Increase induced emf D Stop induction

7

Which device is used to measure electric current?

A Voltmeter B Galvanometer C Ammeter D Ohmmeter

8

In a transistor, current amplification occurs due to:

A Large base current B Small base current C No base current D High voltage

9

The slope of V-I graph represents:

A Current B Voltage C Resistance D Power

10

Which radiation has the highest ionizing power?

A Alpha B Beta C Gamma D X-ray

11

An LED emits light when it is:

A Reverse biased B Forward biased C Unbiased D Overheated

12

The output of OR gate is 0 when:

A Any input is 1 B Both inputs are 1 C Both inputs are 0 D Only one input is 0

13

The basic unit of digital information is:

A Byte B Bit C Word D Nibble

14

Which region of Earth is the main source of geothermal heat?

A Crust B Mantle C Atmosphere D Hydrosphere

15

Which electromagnetic wave carries the least energy?

A Gamma rays B X-rays C Infrared rays D Radio waves

16

What is static electricity?

A Electricity due to moving charges B Electricity produced by batteries C Electricity due to stationary charges D Electricity flowing in circuits

17

The resistance of an ideal voltmeter is:

A Zero B Low C Very high D Equal to ammeter

18

The SI unit of electric current is:

A Volt B Ohm C Ampere D Coulomb

19

Sun appears red at sunrise and sunset due to

A Reflection B Refraction C Scattering D Dispersion

20

Electrostatic precipitators are used to:

A Generate electricity B Remove dust from smoke C Measure voltage D Increase current

21

The rule used to find direction of force on a conductor is:

A Right hand thumb rule B Fleming’s left hand rule C Fleming’s right hand rule D Maxwell’s rule

22

The image formed on the retina of the human eye is:

A Virtual and erect B Real and inverted C Virtual and inverted D Real and erect

23

Which property disappears in superconductors?

A Electric current B Voltage C Electrical resistance D Charge

24

Corona discharge occurs when:

A Field is very weak B Field is slightly below breakdown value C Field is zero D No charge is present

25

The primary waves in earthquakes are:

A Transverse waves B Surface waves C Longitudinal waves D Electromagnetic waves