Physics Questions

If the radius of the earth decreases and its mass remains the same, then the value of "acceleration due to gravity" will _____ .

If the vector sum of torques acting on a system is zero, then the object is in _______.

For which one of the following, 'Diodes' are generally used for?

Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?

Electrons move around the nucleus in _______ motion.

A Sonar of a ship sends sounds waves of speed 1000 m/s. These waves are reflected back by the ocean floor in 2 seconds. Find the depth (in m) of theocean floor. 

When a number of resistors are connected in series in a circuit, the value of current:

Find the power of a convex lens if the image formed is at a distance of 20 cm from the lens when the object is placed on the other side of the lens at 25 cm from the optical centre?