7. ELECTRIC CURRENT

Question 1

Who founded and named the science of electromagnetism?

Answer 1

Andre Marie Ampere

Question 2

Which of the following are the highest-frequency electromagnetic waves?

Answer 2

Gamma Rays

Question 3

Ohm’s Law states that:

Answer 3

Electric current= Voltage/ Resistance
Explanation: Ohm’s law states that the electrical Current (I) flowing in a circuit is proportional to the voltage (V) and inversely proportional to the resistance (R).

Question 4

.Magnetic Field inside the solenoid is ______.

Answer 4

uniform

Question 5

Which of the following is NOT a primary force which influences ocean currents?

Answer 5

Magnetic fields of the earth

Question 6

Which of the following instruments can detect the presence of a current in a circuit?

Answer 6

Galvanometer

Question 7

Which law of physics states that the force between the two electric charges reduces to a quarter of its former value when the distance between them is doubled?

Answer 7

Coulomb’s law

Question 8

The rating for a fuse used in a household electric circuit is provided on the basis of:

Answer 8

current

Question 9

Among various electrical safety devices, one based on the heating effect of electric current is called a:

Answer 9

Fuse

Question 10

Electrical conductance through metals is called electronic conductance and it ______.

Answer 10

decreases with increase in temperature

Question 11

Which of the following is NOT a good conductor of electricity?

Answer 11

Graphite