Q. Consider the following statements about the microphone and the speaker of a mobile phone -
1. The microphone converts sound to a mechanical signal.
2. The microphone converts sound to an electrical signal.
3. The speaker converts a mechanical signal to sound.
4. The speaker converts an electrical signal to sound.
Which of the statements given above are correct?
1) 1 and 3
2) 1 and 4
3) 2 and 3
4) 2 and 4
Q. A 100 W electric bulb is used for 10 hours a day. How many units of electrical energy are consumed by the bulb in 3 days (1 unit = 1 kWh)?
1) 3.00
2) 1.08
3) 2.16
4) 0.33
Q. The area under the velocity-time graph for a particle moving in a straight line with uniform acceleration gives -
1) its average velocity
2) its net displacement
3) the distance travelled by it
4) its average speed
Q. The power of a lens of focal length 10 cm is -
1) 0.1 dioptre
2) 1 dioptre
3) 10 dioptre
4) 100 dioptre
Q. The r.m.s. the potential difference between the red live wire and a black neutral wire in Indian domestic electric supply is -
1) 160V
2) 220V
3) 300V
4) 410V
Q. Sound and light waves are -
1) respectively longitudinal and transverse in air
2) respectively transverse and longitudinal in air
3) both longitudinal in air
4) both transverse in air
Q. Three resistors of resistances 11Ω, 220Ω and 330Ω are connected in parallel. Their equivalent resistance is equal to?
1) 66Ω
2) 22Ω
3) 12Ω
4) 6Ω
Q. Which is not a solid-state device?
1) LED
2) CRT
3) PET
4) Tunnel diode
Q. What is not true about hologram?
1) It requires no screen
2) It is obtained by laser
3) It is light source
4) It is a 3-D picture
Q. Electric press, heater, electric kettle, etc., are made of which element?
1) German Silver
2) Constantine
3) Nichrome
4) Carbon
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