Search SchoolNGR

Physics Past Questions and Answers

Classroom

Physics Questions

Question 71:

Which of the following statements is correct? The reading of pressure on a mercury barometer is independent of

SchoolNGR Classroom

A The cross-sectional area of the tube
B The atmospheric pressure
C The density of mercury
D The temperature of mercury
E The acceleration due to gravity

View Answer & Explanation

Question 72:

What are the units of thermal conductivity?

SchoolNGR Classroom

A Kg.m.sec<sup style='font-size: smaller;'>2</sup>
B Joule sec<sup style='font-size: smaller;'>-1</sup>m<sup style='font-size: smaller;'>-1</sup>k<sup style='font-size: smaller;'>-1</sup>
C Kg.m
D Newton sec<sup style='font-size: smaller;'>-1</sup>m<sup style='font-size: smaller;'>2</sup>
E M<sup style='font-size: smaller;'>3</sup>

View Answer & Explanation

Question 73:

Which of the following statements is correct? The magnetized state of an iron bar can be destroyed completely by

SchoolNGR Classroom

A Heating the bar to a high temperature
B Breaking the bar
C Connecting opposite poles with a small piece of iron
D Placing the bar inside a strong magnetic field
E None of the above

View Answer & Explanation

Question 74:

An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?

SchoolNGR Classroom

A 5 volts
B 3.5 volts
C 2.5 volts
D 1 volts
E 10 volts

View Answer & Explanation

Question 75:

Which of the following is the correct definition of 'half-life'?

SchoolNGR Classroom

A The average life-time of a radioactive material
B The time it takes a radioactive material to decay to half of its original quantity
C Half the period a radioactive material decays completely
D Half of the decay constant
E The decay constant times life-time

View Answer & Explanation

Stay Updated

Follow us on:

Subjects