Question

$S_1$: In an elastic collision initial and final K.E. of system will be same.
$S_2$: In a pure $L-C$ Circuit average energy stored in capacitor is zero.
$S_3$: In $YDSE$ coherent sources are formed by division of wave front method.
$S_4$: If a physical Quantity is quantized then it must be integral multiple of it's lowest value.

• A. $FFTF$
• B. $TTFT$
• C. $FTFT$
• D. $TFTF$

Answer 1

The correct option is D $TFTF$

In elastic collision, no energy remains stored as potential energy after collision.Hence by conservation of energy, initial and final kinetic energies are equal.

Hence $S_1$ is true.

Energy stored in capacitor $=Q^2/2C>0$ for $Q\ne 0\Rightarrow$ Average energy stored>0
Hence $S_2$ is false

In YDSE, a primary source is followed by 2 slits positioned symmetrically so that the 2 secondary sources are in phase (coherent).
Hence $S_3$ is correct.

Quantization implies the physical quantity attains discrete values.They need not be integral multiple of ground level.

Hence $S_4$ is false.