General Physics Questions And Answers, Set 66

 

General Physics Questions And Answers

Q1. 

Earth’s potential is _______

Ans.

Zero

Q2. 

If a charged body is moved in an electric field against the Coulomb force, then ________

Ans.

Work is done on the body by an external agent

Q3. 

In a potentiometer of 5 wires, the balance point is obtained on the 2nd wire. To shift the balance point to the 4th, we should decrease the current of the main circuit.

Ans.

True

Q4. 

Pick out the application of potentiometer from the following.

Ans.

It measures internal resistance

Q5. 

The sensitivity of the meter bridge is at the peak when all resistors have the same order.

Ans.

True

Q6. 

Which of the following relation is significant for metals when the temperature increases?

Ans.

Resistivity increases and conductivity decreases

Q7. 

Which among the following has weak temperature dependence values with resistivity?

Ans.

Nichrome

Q8. 

The resistivity of semiconductors and insulators decreases linearly with the increase of temperature.

Ans.

False

Q9. 

The resistivity of ‘X’ decreases with temperature and its coefficient of resistivity is negative. Identify X.

Ans.

Silicon

Q10. 

Which of the following is not a valid reason for using alloys to make standard resistors?

Ans.

Alloys have a large temperature coefficient

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