#### Term II Model Question Paper

11th Standard

Reg.No. :
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Physics

Time : 02:30:00 Hrs
Total Marks : 70
15 x 1 = 15
1. One of the combinations from the fundamental physical constants is ${{hc}\over{G}},$ The unit of this expression is

(a)

Kg2

(b)

m3

(c)

S-1

(d)

m

2. The dimension of ${\left( {\mu}_{0}{\epsilon}_{0} \right)}^{{{1}\over{2}}}$ is

(a)

length

(b)

time

(c)

velocity

(d)

force

3. If a particle has negative velocity and negative acceleration, its speed

(a)

increases

(b)

decreases

(c)

remains same

(d)

zero

4. When a car takes a sudden left turn in the curved road, passengers are pushed towards the right due to

(a)

inertia of direction

(b)

inertia of motion

(c)

inertia of rest

(d)

absence of inertia

5. Force acting on the particle moving with constant speed is

(a)

always zero

(b)

need not be zero

(c)

always non zero

(d)

cannot be concluded

6. A uniform force of (2$\hat { i }$+$\hat { j }$) N acts on a particle of mass 1 kg. The particle displaces from position (3$\hat { j }$+$\hat { k }$) m to (5$\hat { i }$+3$\hat { j }$) m. The work done by the force on the particle is

(a)

9 J

(b)

6 J

(c)

10 J

(d)

12 J

7. A couple produces,

(a)

pure rotation

(b)

pure translation

(c)

rotation and translation

(d)

no motion

8. An object of mass 10 kg is hanging on a spring scale which is attached to the roof of a lift. If the lift is in free fall, the reading in the spring scale is

(a)

98 N

(b)

zero

(c)

49 N

(d)

9.8 N

9. Which of the following is not a scalar?

(a)

viscosity

(b)

surface tension

(c)

pressure

(d)

stress

10. When a uniform rod is heated, which of the following quantity of the rod will increase

(a)

mass

(b)

weight

(c)

center of mass

(d)

moment of inertia

11. If the internal energy of an ideal gas U and volume V are doubled then the pressure

(a)

doubles

(b)

remains same

(c)

halves

(d)

12. If the temperature and pressure of a gas is doubled the mean free path of the gas molecules

(a)

remains same

(b)

doubled

(c)

tripled

(d)

13. A particle executing SHM crosses points A and B with the same velocity. Having taken 3 s in passing from A to B, it returns to B aft er another 3 s. Th e time period is

(a)

15 s

(b)

6 s

(c)

12 s

(d)

9 s

14. Which of the following differential equations represents a damped harmonic oscillator?

(a)

$\frac { { d }^{ 2 }y }{ { dt }^{ 2 } } +y=0$

(b)

$\frac { { d }^{ 2 }y }{ { dt }^{ 2 } } +\gamma \frac { dy }{ d } +y=0$

(c)

$\frac { { d }^{ 2 }y }{ { dt }^{ 2 } } +{ k }^{ 2 }+y=0$

(d)

$\frac { dy }{ d } +y=0$

15. The displacement y of a wave travelling in the x direction is given by y= (2 x10 -3) sin (300t -2x+$\frac{\pi}{4}$), where x and y are measured in metres and t in second. The speed of the wave is

(a)

150 ms-1

(b)

300 ms-1

(c)

450 ms-1

(d)

600 ms-1

16. 6 x 2 = 12
17. Define a vector. Give examples.

18. Why does a parachute descend slowly?

19. Which is the greatest force among the three force $\bar { { F }_{ 1 } } ,\bar { { F }_{ 2 } } ,\bar { { F }_{ 3 } }$, shown below:

20. Explain the characteristics of elastic and inelastic collision.

21. State Kepler’s three laws.

22. Define weight.

23. 6 x 3 = 18
24. What are the limitations of dimensional analysis?

25. Define acceleration.

26. State Newton's second law.

27. Define centre of mass.

28. Describe the Brownian motion.

29. Describe the formation of beats.

30. 5 x 5 = 25
31. Explain in detail the various types of errors.

32. State and explain work energy principle. Mention any three examples for it.

33. State and prove parallel axis theorem

34. Discuss the important features of the law of gravitation.

35. Explain the different types of modulus of elasticity.