Physics Questions

It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

What is the effective resistance (in Ω) of two resistors 21 Ω and 28 Ω connected in parallel?

Which of the following statements is/are INCORRECT?

A. The value of G on the moon is equal to that on the earth.

B. 26.68 x 10-11 N is the force of gravitation between two point masses of 2 kg and 2kg kept 1 m apart.

C. Newton's law of gravitation is valid in the laboratory only.

D. Force is inversely proportional to the square of the distance between two bodies.

What is the heat released by a heating filament rated 20 W when it is kept on for 2 seconds?

A plane mirror produces a magnification of

Which of the following is a bad conductor of heat?

Calculate the pressure (in Pa) if a thrust of 1000 N is applied to an area of 5 sq.m.

Which of the following electromagnetic waves has minimum wavelength?