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
Q. Which of the following laws deduces the expression for the force between two stationary point charges in vacuum or free space?
1) Lenz's Law
2) Coulomb's Law
3) Gauss' Law
4) Ohm's Law
Q. An iron hammer, Iying in the sun, appears much hotter than its wooden handle because -
1) Iron is at a higher temperature
2) Iron is darker than wood
3) Iron absorbs more heat
4) Iron is a good conductor of heat
Q. A non-electronic conductor is -
1) Iron
2) Gas carbon
3) Copper Sulphate
4) Mercury
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