Physics Test 14

Result

Physics Test 14

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Weekly Quiz Competition

Question 1
4 / -1

If C_p and C_v denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then

A
C_p – C_v = R

B
C_p – C_v = 28R

C
C_p – C_v = R/28

D
C_p – C_v = R/14.

Solution

Mayer Formula.
Question 2
4 / -1

Angular momentum of the particle rotating with a central force is constant due to

A
zero torque

B
constant torque

C
constant force

D
constant linear momentum.

Solution

Central forces always act along the axis of rotation. Therefore, the torque is zero. And if there is no external torque acting on a rotating body then its angular momentum is constant.
Question 3
4 / -1

An observer looks at a distance tree of height 10m with a telescope of magnifying power of 20. To the observer the tree appears:

A
20 times taller

B
20 times nearer

C
10 times taller

D
10 times nearer

Solution

In case of telescopes, magnifying power = 20 means that the object appears 20 times nearer.
Hence option B is correct.