SS 2 Third Term Examination PHYSICS

CLASS: SS 2

SUBJECT: PHYSICS

Objective Questions

1. Which of the following is not a vector quantity?
   (a) Speed
   (b) Force
   (c) Velocity
   (d) Acceleration
2. Which of the following is not a scalar quantity?
   (a) Density
   (b) Speed
   (c) Temperature
   (d) Weight
3. Two forces, whose resultant is 100N, are perpendicular to each other. If one of them makes an angle of 60° with the resultant, calculate its magnitude.
   (Sin 60° = 0.8660, Cos 60° = 0.5000)
   (a) 200.0 N
   (b) 173.2 N
   (c) 115.5 N
   (d) 86.6 N
4. Find by drawing and by calculating the resultant of two vectors of 3 units and 4 units inclined to each other at:
   (a) 30°
   (b) 90°
   (c) 120°
   (d) 75°
5. Resolve a force of 100N inclined at 50° to the horizontal. Calculate the horizontal components.
   (a) 62.28 N
   (b) 60.28 N
   (c) 70.00 N
   (d) 28.60 N
6. A body starts from rest and moves with constant acceleration. Which of the following quantities varies linearly with the square of time?
   I. Velocity
   II. Displacement
   III. Momentum
   (a) I only
   (b) II only
   (c) I and II only
   (d) III only
7. A body which is uniformly retarded comes to rest in 10s after traveling a distance of 20m. Calculate its initial velocity:
   (a) 0.5 m/s
   (b) 2.0 m/s
   (c) 20.0 m/s
   (d) 200.0 m/s
8. A mango fruit drops to the ground from the top of its tree which is 5m high. How long does it take to reach the ground?
   (a) 1.05 s
   (b) 2.05 s
   (c) 3.05 s
   (d) 0.55 s
9. Calculate the height from which a body is released from rest if its velocity just before hitting the ground is 30 m/s.
10. ____________ is the time required for a projectile to return to the same level from which it was projected.
    (a) Maximum height
    (b) Time of flight
    (c) Range
    (d) None of the above
11. The formula for range is ____________.
    (a) R=u2sin⁡2θgR = \frac{u^2 \sin 2\theta}{g}R=gu2sin2θ​
    (b) R=u2sin⁡2θgR = \frac{u^2 \sin^2 \theta}{g}R=gu2sin2θ​
    (c) $R=2u\sin \theta$
    (d) R=12gT2R = \frac{1}{2}gT^2R=21​gT2
12. A ball is projected horizontally from the top of a hill with a velocity of 30 m/s. If it reaches the ground 5 seconds later, the height of the hill is:
    (a) 20 m
    (b) 125 m
    (c) 250 m
    (d) 65 m
13. ____________ is the highest vertical distance attained as measured from the horizontal projection plane.
    (a) Time of flight
    (b) Maximum height
    (c) Range
    (d) Time of motion
14. ____________ is a single force which, acting alone, will have the same effect in magnitude and direction as two or more forces acting together.
    (a) Resultant
    (b) Force
    (c) Moment
    (d) Opposition
15. The SI unit of the moment of a force is:
    (a) kgm
    (b) Nm
    (c) Nm−1^{-1}−1
    (d) Jm
16. ____________ is the state when a body is either not rotating at all or is rotating at a constant angular velocity.
    (a) Equilibrium
    (b) Dynamic
    (c) Rotation
    (d) Resultant
17. A uniform meter rule balances on a knife edge at the 55 cm mark when a mass of 40 g is hung from the 95 cm mark. Find the weight of the ruler.
    (a) 32 kg
    (b) 0.32 kg
    (c) 45 kg
    (d) 5 kg
18. ____________ is when the velocity decreases by equal amounts in equal times.
    (a) Uniform velocity
    (b) Acceleration
    (c) Uniform acceleration
    (d) Speed
19. ____________ is the heat supplied or removed which causes a change of state without a change in temperature.
    (a) Latent heat
    (b) Vaporization
    (c) Heat of fusion
    (d) Specific heat
20. ____________ is a process where a liquid turns spontaneously into vapor below its boiling point.
21. A stationary bell is hit by an average force of 50 N for a time of 0.03 seconds. What is the impulse experienced by the body?
    (a) 15 Ns
    (b) 1.5 Ns
    (c) 1.25 Ns
    (d) 2.5 Ns
22. A meter rule is pivoted at its midpoint C with a vertical force of 10 N hanging from a distance of 30 cm from C. At what distance must a 15 N force hang to balance the ruler horizontally?
    (a) 30 cm
    (b) 20 cm
    (c) 20 cm
    (d) 25 cm
23. For a projectile, the maximum range is obtained when the angle of projection is:
    (a) 60°
    (b) 30°
    (c) 45°
    (d) 75°
24. A ball is released from a height above the ground. Find its velocity after 5 seconds. Take $g$ as 10 m/s².
    (a) 20 m
    (b) 5 m
    (c) 50 m
    (d) 60 m
25. The derived unit of pressure can be expressed as:
    (a) kgm−1^{-1}−1s−1^{-1}−1
    (b) kgm/s²
    (c) kgm−2^{-2}−2s−2^{-2}−2
    (d) kgm−1^{-1}−1s−2^{-2}−2
26. Which of the following devices is used to determine the relative intensity of an acid?
    (a) Manometer
    (b) Hydrometer
    (c) Hypsometer
    (d) Hygrometer
27. Which of the following substances is the most volatile at room temperature?
    (a) Water
    (b) Diesel
    (c) Petrol
    (d) Kerosene
28. The movement of fluid up or down a narrow tube is ____________.
    (a) Brownian motion
    (b) Capillarity
    (c) Diffusion
    (d) Osmosis
29. The SI unit of heat is ____________.
    (a) Joule
    (b) Kelvin
    (c) Watt
    (d) Ampere
30. The tendency for a stationary body to remain at rest when a force is applied to it is known as ____________.
    (a) Impulse
    (b) Inertia
    (c) Momentum
    (d) Friction
31. When a body is slightly tilted, it is found that its center of gravity is slightly raised. What is the state of equilibrium of the body?
    (a) Unstable
    (b) Neutral
    (c) Cannot be determined
32. A ball falling through a viscous liquid is acted upon by:
    (a) Upthrust only
    (b) Upthrust and the ball’s weight
    (c) The ball’s weight and viscous force
    (d) Upthrust, the ball’s weight, and viscous force
33. Alcohol of mass 21 g and density 0.7 g/cm³ is mixed with 10 g of water. Determine the density of the mixture (Density of water = 1.0 g/cm³).
    (a) 0.775 g/cm³
    (b) 0.780 g/cm³
    (c) 0.875 g/cm³
    (d) 0.880 g/cm³
34. The SI unit of power is ____________.
    (a) N
    (b) Pa
    (c) W
    (d) J
35. The device that converts mechanical energy into electrical energy is a ____________.
    (a) Dynamo
    (b) An electric motor
    (c) An induction coil
    (d) A transformer

36. Heat transfer by conduction is similar to wave motion because:
    (a) There is an increase in temperature
    (b) Transfer of materials is involved
    (c) Charged particles vibrate at right angles
    (d) No transfer of material is involved
37. An electric motor converts:
    (a) Electrical energy to mechanical energy
    (b) Mechanical energy to electrical energy
    (c) Mechanical energy to sound energy
    (d) Electrical energy to thermal energy
38. Which of the following units is derived?
    (a) kg
    (b) m
    (c) K
    (d) N
39. Which of the following is not a vector quantity?
    (a) Speed
    (b) Force
    (c) Velocity
    (d) Acceleration
40. Which of the following is not a scalar quantity?
    (a) Density
    (b) Speed
    (c) Temperature
    (d) Weight
41. Two forces, whose resultant is 100N, are perpendicular to each other. If one of them makes an angle of 60° with the resultant, calculate its magnitude.
    (a) 200.0 N
    (b) 173.2 N
    (c) 115.5 N
    (d) 86.6 N
42. Find by drawing and by calculating the resultant of two vectors of 3 units and 4 units inclined to each other at:
    (a) 30°
    (b) 90°
    (c) 120°
    (d) 75°
43. Resolve a force of 100N inclined at 50° to the horizontal. Calculate the horizontal components.
    (a) 62.28 N
    (b) 60.28 N
    (c) 70.00 N
    (d) 28.60 N
44. A body starts from rest and moves with constant acceleration. Which of the following quantities varies linearly with the square of time?
    I. Velocity
    II. Displacement
    III. Momentum
    (a) I only
    (b) II only
    (c) I and II only
    (d) III only
45. A body which is uniformly retarded comes to rest in 10s after traveling a distance of 20m. Calculate its initial velocity:
    (a) 0.5 m/s
    (b) 2.0 m/s
    (c) 20.0 m/s
    (d) 200.0 m/s
46. A mango fruit drops to the ground from the top of its tree which is 5m high. How long does it take to reach the ground?
    (a) 1.05 s
    (b) 2.05 s
    (c) 3.05 s
    (d) 0.55 s
47. Calculate the height from which a body is released from rest if its velocity just before hitting the ground is 30 m/s.
48. ____________ is the time required for a projectile to return to the same level from which it was projected.
    (a) Maximum height
    (b) Time of flight
    (c) Range
    (d) None of the above
49. A ball is projected horizontally from the top of a hill with a velocity of 30 m/s. If it reaches the ground 5 seconds later, the height of the hill is:
    (a) 20 m
    (b) 125 m
    (c) 250 m
    (d) 65 m
50. ____________ is the highest vertical distance attained as measured from the horizontal projection plane.
    (a) Time of flight
    (b) Maximum height
    (c) Range
    (d) Time of motion
51. ____________ is a single force which, acting alone, will have the same effect in magnitude and direction as two or more forces acting together.
    (a) Resultant
    (b) Force
    (c) Moment
    (d) Opposition
52. The SI unit of the moment of a force is:
    (a) kgm
    (b) Nm
    (c) Nm−1^{-1}−1
    (d) Jm
53. ____________ is the state when a body is either not rotating at all or is rotating at a constant angular velocity.
    (a) Equilibrium
    (b) Dynamic
    (c) Rotation
    (d) Resultant
54. A uniform meter rule balances on a knife edge at the 55 cm mark when a mass of 40 g is hung from the 95 cm mark. Find the weight of the ruler.
    (a) 32 kg
    (b) 0.32 kg
    (c) 45 kg
    (d) 5 kg
55. ____________ is when the velocity decreases by equal amounts in equal times.
    (a) Uniform velocity
    (b) Acceleration
    (c) Uniform acceleration
    (d) Speed
56. ____________ is the time required for a projectile to return to the same level from which it was projected.
    (a) Maximum height
    (b) Time of flight
    (c) Range
    (d) None of the above

Theory Questions

1. Define latent heat of vaporization.
2. Define specific heat capacity.
3. What is a moment?
4. A body of mass 3.0 kg moves with a velocity of 10 m/s. Calculate its momentum.
5. State the applications of thermal expansion.
6. State three methods of heat transfer.

1. (a) Define vector quantities and scalar quantities.
   (b) Give 3 examples of vector and scalar quantities.
2. State the law of parallelogram of vector addition.
3. Find by drawing and by calculation the resultant of two vectors 3 units and 4 units inclined to each other at 90°.
4. State the three equations of motion.
5. A car accelerates uniformly at a rate of 10 m/s² from an initial velocity of 36 km/h for 3 seconds. Find the distance covered during this period.
6. A body moving with an initial velocity of 30 m/s accelerates uniformly at a rate of 10 m/s² until it attains a velocity of 50 m/s. What is the distance covered during this period?
7. A projectile is fired with an initial velocity of 100 m/s at an angle of 30° with the horizontal. Calculate: (i) The time of flight
   (ii) The maximum height attained
   (iii) The range
8. Define the following: (a) Time of flight
   (b) Maximum height