Physics - Study Mode

[#191] Erg cross Sec is the unit of
Correct Answer

(C) Planck's constant

Explanation

Solution: Erg * Sec is the unit of Planck's Constant.

[#192] A dynamometer wattmeter can be used for
Correct Answer

(C) Both A & B

Explanation

Solution: Dynamometer type wattmeter is used for the measurement of A.C. as well as D.C. power. It consists of a fixed coil forming the current coil whereas the moving coil forms the potential coil.

[#193] Kirchhoff's laws are applicable to
Correct Answer

(C) D.C. and A.C. circuits both

Explanation

Solution: Kirchhoff's laws are applicable to both D.C. and A.C. circuits.

[#194] The device which converts AC to DC is
Correct Answer

(C) Rectifier

Explanation

Solution: A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it "straightens' the direction of current.

[#195] When a bullet is fired from a gun
Correct Answer

(D) The gun recoils with the same momentum as the bullet

Explanation

Solution: When a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction. This is force is called as the action force. The bullet also exerts an equal and opposite force on the gun in the backward direction. Therefore a gun recoils when a bullet is fired from it.