## Test your physics (conceptual questions for JEE)

Answer the question in this post to test your concepts for competitive exams.

Learn free for class 9th, 10th science/maths , 12th and IIT-JEE Physics and maths.

Answer the question in this post to test your concepts for competitive exams.

This post contains conceptual questions for class 12 board exams although anyone can solve them if interested.

Try to solve these questions on your own in my net post I’ll publish 3 marks and 5 marks sample questions.

Question 1. W cm apart on a hat is the amount of work done in moving 100 nC charge between two points 5 cm apart on an equipotential surface?

1) If the total external force acting on a rigid body is zero, then

(a) only linear momentum remains constant

(b) only angular momentum remains constant

(c) both linear momentum and angular momentum remains constant

(d) neither linear momentum nor angular momentum remain constant

2) A ball of mass M is tied to a string of length L is whirled round in a horizontal plane in a circle of radius R. The speed of the stone is increased beyond the maximum permissible value and the string breaks suddenly; then

(a) the stone will jerk radially outwards

Question: If you are riding on a train that speeds past other train moving in the same direction on adjacent train.It appears the other train is moving backward. Why?

Solution:

Your reference frame is that of the train you are riding. If you are traveling with a relatively constant velocity (not over