When two bodies are rubbed against each other-
- They acquire equal and similar charges
- They acquire equal and opposite charges
- They acquire unequal and similar charges
- They acquire unequal and opposite charges
Lightning is caused in the sky due to the flow of charge between-
- Two oppositely charged clouds
- Two similarly charged clouds
- One neutral and one charged cloud
- None of these
Which of these converts sunlight directly into electrical energy?
- Solar cooker
- Solar cell
- Solar furnace
- Solar water heater
Electric charge can flow through-
- Insulators
- Conductors
- Both insulators and conductors
- Neither conductors nor insulators
The electric current which changes its direction after fixed intervals of time is called-
- Induced current
- Direct current
- Alternating current
- None of these
A device used to stabilize the voltage supplied by electric supply station is a-
- Dynamo
- Transformer
- Ammeter
- Generator
Silver is a-
- Magnetic substance
- Good conductor of electricity
- A bad conductor of electricity
- None of these
An instrument used to observe heavenly bodies is the-
- Telescope
- Camera
- Microscope
- Periscope
The maximum percentage in the atmosphere is of-
- Oxygen
- Nitrogen
- Carbon dioxide
- Helium
The colors on a color code resistor are green, white, orange and silver. Find the value of resistor-
- 5.9 × 10³ ±10%
- 59 × 10³ ± 10%
- 590 × 10³ ±10%
- 5900 × 10² ± 10%
The eddy current loss is directly proportional to-
- Area of metal
- Volume of metal
- Length of metal
- Weight of metal
The direction of dynamically induced e.m.f is given by-
- Lenz’s law
- Flemings right-hand rule
- Flemings left-hand rule
- Corkscrew rule
The basis for measuring a thermodynamic property of temperature is given by-
- Zeroth law of thermodynamics
- The first law of thermodynamics
- The second law of thermodynamics
- Third law of thermodynamics