Half Book 1

1

Sound waves are:

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

2

In acoustics, absorption of sound is increased by:

A Hard surfaces B Smooth walls C Soft materials D Metal sheets

3

Which energy source is eco-friendly?

A Coal B Oil C Geothermal D Gasoline

4

Rods in the human eye are sensitive to:

A Color B Bright light C Dim light D Ultraviolet light

5

A convex lens is also known as:

A Diverging lens B Converging lens C Plane lens D Negative lens

6

Minimum distance for hearing echo in air is about:

A 5 m B 10 m C 17 m D 50 m

7

Which instrument uses lenses to view very small objects?

A Telescope B Periscope C Microscope D Camera obscura

8

When a charged body is earthed, it becomes:

A More charged B Negatively charged C Neutral D Positively charged

9

Thermal expansion in liquids is measured by:

A Linear expansion B Area expansion C Volume expansion D Mass expansion

10

Electrostatic precipitators are used to:

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

11

Echo is heard when reflected sound reaches the ear after:

A 0.01 s B 0.05 s C 0.1 s D 1 s

12

The sound produced by regular vibrations is called:

A Noise B Music C Echo D Ultrasound

13

Solar cooker works mainly on:

A Conduction B Convection C Radiation D Evaporation

14

Evaporation causes cooling because:

A Temperature increases B High energy molecules escape C Pressure increases D Density increases

15

The wavelength of a tsunami in deep water is:

A Very small B Moderate C Very large D Zero

16

Heat transfer in room heaters mainly occurs by:

A Conduction B Radiation C Convection D Evaporation

17

Which animal can hear ultrasound?

A Elephant B Dog C Bat D Cow

18

Which of the following is NOT a characteristic of sound?

A Loudness B Pitch C Speed D Colour

19

Gravitational lensing occurs due to:

A Strong electric fields B Magnetic fields C Gravitational fields of massive objects D Atmospheric refraction

20

Unpleasant and unwanted sound is called:

A Music B Echo C Noise D Pitch

21

Which has higher latent heat of vaporization?

A Water B Alcohol C Petrol D Mercury

22

In solids, particles are:

A Far apart and free B Closely packed and vibrate about fixed positions C Completely free to move D Not moving at all

23

Sound cannot travel through:

A Air B Water C Steel D Vacuum

24

Which property disappears in superconductors?

A Electric current B Voltage C Electrical resistance D Charge

25

Which of the following expands the most on heating?

A Solids B Liquids C Gases D All expand equally