QuestionKart - Questions

cds- Question :

A body is falling freely under the action of gravity alone in vacuum. Which one of the following remains constant during the fall?

A :

(a) Potential energy

B :

(b) Kinetic energy

C :

D :

(d) Total mechanical energy

cds- Question :

An object is raised to a height of 2 m from the ground. It is then allowed to fall on to a table 1 m high from ground level. In this context, which one among the following statements is correct ?

A :

Its potential energy decreases by two-thirds its original value of total energy

B :

Its potential energy decreases by one-third its original value of total energy.

C :

Its kinetic energy increases by two-thirds, while potential energy increases by one-third.

D :

Its kinetic energy increases by one-third, while potential energy decreases by one-third.

cds- Question :

X-rays are

A :

deflected by an electric field but not by a magnetic field

B :

deflected by a magnetic field but not by an electric field

C :

deflected by both a magnetic field and an electric field

D :

not deflected by an electric field or a magnetic field

cds- Question :

Two wires are made having same length / and area of cross-section A. Wire 1 is made of copper and wire 2 is made of aluminium. It is given that the electrical conductivity of copper is more than that of aluminium. In this context, which one of the following statement is correct?

A :

The resistance of wire 1 will be higher than that of wire 2

B :

The resistance of wire 2 will be higher than that of wire 1

C :

The resistance of both the wire will be the same

D :

If same current is flown through both the wires, the power dissipated in both the wire will be the same

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