Voltage, Current and Resistance – Exercise – 1

6. Which of the following is not a type of energy source?

(a) generator
(b) rheostat
(c) solar cell
(d) battery

Answer
Answer : (b)
Explanation
Explanation :

Generator = Convert mechanical energy to electrical energy,
Solar cell = Convert light energy to electrical energy,
Battey = Convert chemical energy to electrical energy.
Rheostat = Variable resistance.

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7. A two-terminal variable resistor is known as a ________.

(a) potentiometer
(b) thermistor
(c) rheostat
(d) wiper

Answer
Answer : (c)
Explanation
Explanation :

Potentiometer: Adjustable resistor has 3 terminals.
Rheostat: Adjustable resistor has 2 terminals.
Thermistor: Change resistance when temperature changes.
Wiper : Sliding contact in a Potentiometer.

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8. Electrons in the outer orbit are called :

(a) nuclei
(b) valences
(c) waves
(d) shells

Answer
Answer : (b)
Explanation
Explanation :

The outer shell of any atom is called the valence shell and the electrons in the outer orbit are called valences.

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9. A neutral atom with an atomic number of five has how many electrons?

(a) 1
(b) 5
(c) none
(d) depends on the type of atom

Answer
Answer : (b)
Explanation
Explanation :

In a neutral atom,
Atomic number = Number of electron/proton.
If atomic number is 5 then number of electrons is also 5.

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10. An ammeter is an electrical instrument used to measure ________.

(a) current
(b) voltage
(c) resistance
(d) none of the above

Answer
Answer : (a)
Explanation
Explanation :

An ammeter measures current (in ampere) in the circuit.

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