Subject

Physics

Class

NEET Class 12

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NEET Physics Solved Question Paper 2011

Multiple Choice Questions

11.
Which of the following equation does not represent a SHM?

cosωt + sinωt

sinωt $-$ cosωt

1 $-$ sin2ωt

sinωt + cos (ωt + $α$ )

1 $-$ sin2ωt

(a) (cosωt + sinωt ) is a periodic function. It can also be written as

= $\frac{\sqrt{2}}{\sqrt{2}} sinωt + \frac{\sqrt{2}}{\sqrt{2}} cosωt$

= $\sqrt{2} (\cos \frac{π}{4} sinωt + \sin \frac{π}{4} cosωt)$

= $\sqrt{2} \sin (ωt + \frac{π}{4})$

= $\sqrt{2} \sin (ωt + \frac{π}{4} + 2 π)$

= $\sqrt{2} \sin [ω (t + \frac{2 π}{ω}) + \frac{π}{4}]$

This represents a simple harmonic function with period $\frac{2 π}{ω}$ and phase $\frac{π}{4}$ .

(b) sinωt $-$ cosωt is a periodic function. It can be written as

= $\sqrt{2} [sinωt \cos \frac{π}{4} - cosωt \sin \frac{π}{4}]$

= $\sqrt{2} \sin (ωt - \frac{π}{4})$

= $\sqrt{2} \sin [ω (t + \frac{2 π}{ω}) - \frac{π}{4}]$

This represents a simple harmonic function with period $\frac{2 π}{ω}$ .

This is non periodic function.

(d) F(t) = sin ωt + cos(ωt + $α$ )

also represents dimple harmonic function.

12.

In simple harmonic motion, loss of kinetic energy is proportional to

e^x
x³
logx
x²

13.

Emissive and absorptive power of a material at 2000 K is 8 and 10 respectively, calculate the emissivity of IBB (Ideal black body)

14.

What is your observation when two sources are emitting sound with frequency 499 Hz and 501 Hz?

Frequency of 500 Hz is heard with change in intensity take place twice.
Frequency of 500 Hz is heard with change in intensity take place once.
Frequency of 2 Hz is heard with change in intensity take place once.
Frequency of 2 Hz is heard with change in intensity take place twice.

15.

For an adiabatic process

ΔS = 0
Δu = 0
Q = 0
W = 0

16.

For cyclic process which of the following quantity is zero?

17.

Pressure head in Bernoulli's equation is

$\frac{P ρ}{g}$
$\frac{P}{ρ g}$
ρ g
Pρg

18.

Assertion: Transverse sound wave does not occurs in gases.

Reason: Gases cannot sustain shearing strain.

If both assertion and reason are true and the reason is correct explanation of assertion.
If both assertion and reason are true but reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

19.

Assertion: C_P is always greater than C_V in gases.

Reason: Work done at constant pressure is more than at constant volume

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

20.

Assertion: During rapid pumping of air in tyres, air inside the tyre is hotter than atmospheric air.

Reason: Adiabatic process occurs at very high rate.

If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true but reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.