Physics class 11

Self Evaluation -1

1. .... is not a basic unit.
   1. kilogram
   2. second
   3. newton
   4. ampere
2. The dimensions of kinetic energy is same as that of ..
   1. Force
   2. Work
   3. Momentum
   4. Pressure
3. A car accelerates from rest to 30 m/s in 5 s . Acceleration will be
   1. 4 ms⁻²
   2. 5 ms⁻²
   3. 30 ms⁻²
   4. 6 ms⁻²
4. Equations of motion are applicable to motion with
   1. uniform acceleration
   2. constant velocity
   3. non uniform acceleration
   4. none of these
5. When a force is applied to an object in the direction of motion , what happens to its acceleration ?
   1. increases
   2. decreases
   3. remains the same
   4. depends on the magnitude of force and the mass of the object
6. What is the relationship between acceleration and time for an object moving with constant acceleration?
   1. Linear
   2. exponential
   3. Quadratic
   4. Constant
7. The resultant of two vectors is maximum when the angle between them is
   1. 0⁰
   2. 45⁰
   3. 90⁰
   4. 180⁰
8. What is the angle of projection for maximum range in projectile motion ?
   1. 30⁰
   2. 60⁰
   3. 45⁰
   4. 90⁰
9. The scalar product of two vectors is also known as
   1. cross product
   2. dot product
   3. scalar
   4. vector multiplication
10. Which of the following quantity remains constant throughout projectile motion?
    1. horizontal velocity
    2. vertical velocity
    3. both
    4. none of these
11. Newton's second law of motion is
    1. F = dp/dt
    2. F = mv
    3. F= mv²
    4. F= m²v
12. A ball of mass m strikes a rigid wall with velocity u and rebounds with the same speed. the impulse imparted to the ball by the wall is -
    1. 2mu
    2. mu
    3. zero
    4. -2mu
13. Lubrication is used to
    1. increase the friction
    2. decrease the friction
    3. both
    4. none of these
14. A force of 10N acts on a body of mass 1 kg, then the acceleration produced in the body
    1. 10 m/s
    2. 10 m/s2
    3. 1 m/s2
    4. 1 m/s
15. Relation between kinetic energy (K) and momentum (p) of a body of mass m is
    1. K = pm/2
    2. K= pm²
    3. K = p/m²
    4. K= p²/2m
16. What will be the kinetic energy of an object when its velocity is tripled?
    1. double
    2. triple
    3. nine times
    4. none of these
17. 1 horse power =
    1. 746 W
    2. 446 W
    3. 766 W
    4. none of these
18. kWh is the unit of
    1. work
    2. energy
    3. power
    4. none of these
19. Which is the translatory analogue of moment of inertia?
    1. torque
    2. force
    3. velocity
    4. mass
20. Where is the centre of mass of a uniform rod located?
    1. at one end of the rod
    2. at the mid point of the rod
    3. at the top of the rod
    4. at the bottom of the rod
21. What is the moment of inertia of a solid sphere of mass M and radius R about its diameter ?
    1. (2/3)MR²
    2. (2/5)MR²
    3. (7/5)MR²
    4. (5/3)MR²
22. What is the escape velocity of Earth ?
    1. 10m/s
    2. 100 m/s
    3. 1000 m/s
    4. 11.2 m/s
23. In an elliptical orbit , where is the sun located?
    1. at the centre of the ellipse
    2. at one of the foci
    3. on the major axis
    4. at the apogee
24. The weight of an object on the Moon is approximately...... of its weight on the Earth.
    1. one-sixth
    2. one-third
    3. one-half
    4. the same as
25. For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is
    1. 1/2
    2. 1/√2
    3. 2
    4. √2
26. The restoring force per unit area is known as
    1. strain
    2. elasticity
    3. stress
    4. plasticity
27. Substances which can be stretched to cause large strains are called
    1. brittle
    2. ductile
    3. plastic
    4. elastomer
28. 1 poise = .... Ns/m²
    1. 0.01
    2. 0.1
    3. 1
    4. 10
29. The frictional resistance for fluids in motion is
    1. inversely proportional to the square of the surface area of contact
    2. inversely proportional to the surface area of contact
    3. proportional to the square of the surface area of contact
    4. proportional to the surface area ofcontact
30. A drop of water is broken into two drops. The sum of which property of the two drops is equal to that of the single one ?
    1. radius
    2. surface area
    3. surface energy
    4. volume
31. When water is heated from 0⁰C TO 4⁰C ,the volume of water:
    1. remains the same
    2. decreases
    3. increases
    4. none of these
32. The absorptive power of a perfectly black body is :
    1. zero
    2. 0.5
    3. 1
    4. infinite
33. The zeroth law of thermodynamics leads to the concept of
    1. internal energy
    2. heat energy
    3. pressure
    4. temperature
34. First law of thermodynamics leads to
    1. conservation of mass
    2. conservation of linear momentum
    3. conservation of energy
    4. conservation of angular momentum
35. What is the time period of a pendulum that completes 10 oscillations in 20 seconds ?
    1. 1 second
    2. 2 second
    3. 10 second
    4. 0.5 second
36. What is the S.I. unit of frequency?
    1. hertz
    2. joule
    3. newton
    4. pascal
37. Which of the following is an example of a transverse wave ?
    1. sound wave
    2. light wave
    3. earthquack wave
    4. none of these
38. The maximum displacement of a particle from its equilibrium position in a wave is called
    1. wavelength
    2. amplitude
    3. frequency
    4. period

Self Evaluation -2

1. A cube has a side of length 1.2 × 10⁻² m. Its volume up to correct significant figures is
   1. 1.7 × 10⁻⁶ m³
   2. 1.73 ×10⁻⁶ m³
   3. 1.78 ×10⁻⁶ m³
   4. 1.732 ×10⁻⁶ m³
2. The velocity of a particle (v) at an instant t is given by v = at + bt² . The dimension of b is
   1. [L]
   2. [LT⁻¹]
   3. [LT⁻²]
   4. [LT⁻³]
3. A cyclist moving on a circular track of radius 40 m completes half a revolution in 40 s. Its average velocity is
   1. zero
   2. 2 ms⁻¹
   3. 4π ms⁻¹
   4. 8π ms⁻¹
4. A stone dropped from the bridge reaches the water in 4 seconds. The height of the bridge is
   1. 78.4 m
   2. 2 m
   3. 260 m
   4. 32 m
5. Which of the following is an example of non uniform motion?
   1. A car travelling at a constant speed on a straight road
   2. A car accelerating from rest
   3. A car maintaining a steady speed around a circular track
   4. A car coming to a stone at a traffic light
6. If the dot product of two vectorsA.B = AB, then the angle between A and B is
   1. π
   2. π/2
   3. π/3
   4. 0
7. The direction of velocity and acceleration at the top of the trajectory of a projectile are
   1. parallel to each other
   2. opposite to each other
   3. at an angle of 45° to each other
   4. perpendicular to each other
8. If the magnitude to the resultant force of two forces F and F applied on a body is also F , then the angle between these two will be
   1. 0°
   2. 60°
   3. 90°
   4. 120°
9. What is the magnitude of centripetal acceleration for an object moving in a circle of radius r with speed v ?
   1. a = v/r
   2. a = r/v
   3. a=v²/r
   4. a = r²/v
10. An object of mass m falls freely from a stationary state. What will be the momentum of this object when it falls down a distance h ?
    1. √(mgh)
    2. m√(2gh)
    3. m√(gh)
    4. mgh
11. Newton's second law of motion is
    1. F = dp/dt
    2. F = mv
    3. F = mv²
    4. F = m²v
12. Which frictional force is the lowest?
    1. sliding friction
    2. rolling friction
    3. static friction
    4. both (a) and (b)
13. The coefficient of friction between the tyres and road is 0.1. The maximum speed with which a cyclist can take a circular turn of radius 3 m without skidding is (Take g = 10 ms⁻²)
    1. √15 ms⁻¹
    2. √3 ms⁻¹
    3. √30 ms⁻¹
    4. √10 ms⁻¹
14. Two bodies of masses 2 kg and 32 kg have equal Kinetic energy. What is the ratio of their momentum ?
    1. 1:1
    2. 1:2
    3. 1:4
    4. 2:1
15. If a force F is applied on a body and it moves with velocity v, then its power will be
    1. F v
    2. F v²
    3. F/v
    4. F/v²
16. For an elastic collision the coefficient of restitution (e) will be
    1. e>1
    2. e<1<1 li="">
    3. e =1
    4. e = 0
17. Where is the centre of mass of uniform rod located ?
    1. at one end of the rod
    2. at the midpoint of the rod
    3. at the top of the rod
    4. at the bottom of the rod
18. Which of the following is constant, when external torque acting on a body is zero ?
    1. linear momentum
    2. angular momentum
    3. force
    4. linear impulse
19. What is the moment of inertia of a cylindrical shell of mass M and radius R about its own axis ?
    1. MR²
    2. (1/2)MR²
    3. 2 MR²
    4. (2/3)MR²
20. Kepler's second law is a consequence of
    1. conservation of energy
    2. conservation of linear momentum
    3. conservation of mass
    4. conservation of angular momentum
21. If Vₑ is the escape velocity and Vₒ is orbital velocity of a satellite for orbit close to the earth's surface, then these are related by
    1. Vₒ =√2 Vₑ
    2. Vₒ = Vₑ
    3. Vₑ =Vₒ/2
    4. Vₑ = √2 Vₒ
22. Gravitational potential at a distance r from a body of mass M is
    1. GM/r
    2. GM/r²
    3. -GM/r
    4. -GM/r²
23. In magnitude, hydraulic stress is equal to
    1. hydraulic force
    2. hydraulic pressure
    3. restoring force
    4. hydraulic strain
24. According to Hooke's law of elasticity, if stress is increased, then the ratio of stress to strain
    1. becomes zero
    2. remains constant
    3. decreases
    4. increases
25. The frictional resistance for fluid in motion is
    1. inversely proportional to the square of the surface area of contact
    2. inversely proportional to the surface area of contact
    3. proportional to the square of the surface area of contact
    4. proportional to the surface area of contact
26. Liquid pressure depends upon
    1. area of the liquid surface
    2. shape of the liquid surface
    3. height of the liquid column
    4. directions
27. Mercury doesn't wet glass. This property of liquid is known as
    1. adhesion
    2. surface tension
    3. viscosity
    4. compressibility
28. Heat is associated with
    1. Kinetic energy of random motion of molecules
    2. kinetic energy of orderly motion of molecules
    3. total Kinetic energy of orderly of molecules
    4. Kinetic energy of random motion in some cases and kinetic energy of orderly motion in another cases
29. If Cₚ and Cᵥ are the specific heat capacity at constant pressure and specific heat capacity at constant volume , then which option is correct?
    1. Cₚ < Cᵥ
    2. Cₚ > Cᵥ
    3. Cₚ = Cᵥ
    4. Cₚ ~ Cᵥ
30. In which substance does conduction mode of heat transfer take place?
    1. solid
    2. liquid
    3. gaseous
    4. all of these
31. First law of thermodynamics leads to
    1. conservation of mass
    2. conservation of linear momentum
    3. conservation of energy
    4. conservation of angular momentum
32. During reversible process, loss of energy is
    1. low
    2. high
    3. zero
    4. infinity