27. Refraction at Plane surfaces and Total internal reflection
28. Refraction through prism and Dispersion of Light
29. Refraction through Lenses
30. Chromatic abberation in Lenses, Optical instruments and Human eye
31. Velocity of Light
32. Photometry
33. Wave nature of Light
34
Electrostatics
34. Charge and Force
35. Electric Field and Potential
36. Capacitance
37
Electrodynamics
37. Electric current
38. Heating Effect of Current
39. Thermoelectricity
40. Chemical effect of Current
41. Meters
42
Electromagnetism
42. Properties of Magnets
43. Magnetic effects of Current
44. Electromagnetic induction
45. Alternating current
46
Modern Physics
46. Cathode rays, Positive rays and Electrons
47. Photoelectric effect
48. X-rays
49. Atomic structure and Spectrum
50. Radioactivity
51. Nuclear physics
52. Semiconductor and Semiconductor devices
53. Diode and Triode valves
54. Logic gates
55. Relativity and Universe
56. Particle physics
57
Mechanics
7. Work, Energy, Power and Collision
1. If a lift of mass 1000 kg moves upward with acceleration of 1 m/s then tension is:
[BP 2011]
6,000
11,00
10,800
2000
(b) Tension T = m(g + a) = 1000 kg * (10 m/s² + 1 m/s²) = 11000 N (using g=10 m/s² for simplicity as per options)
2. A boy started his journey from home to school which 16 km far at uniform speed 2.5 Km/hr and while returning, he returned with 4km/hr. What is his average speed?
[BP 2012]
3 km/hr
4 km/hr
6 km/hr
8 km/hr
(a) Average speed = Total distance / Total time = (16 + 16) / (16/2.5 + 16/4) = 32 / (6.4 + 4) = 32 / 10.4 ≈ 3.08 km/hr
3. Which is not graph of uniform motion:
[BP 2012]
() Cannot answer without the graphs.
4. A person on a moving train throws upwards a coin, and if it falls behind him, then train is
[BP 2012]
Accelerating.
Decelerating.
Moving with constant velocity.
All.
(a) If the coin falls behind, it indicates the train's speed increased while the coin was in the air.
5. What is the total tension acting in figure?
[BP 2012]
75 N
37. 5N
50 N
150 N
() Cannot answer without the figure.
6. A boat was crossing the river with velocity 40 m/s and river flowing with velocity 30 m/s. Then resultant velocity was:
[BP 2012]
50 m/s
60 m/s
100 m/s
120 m/s
(a) Resultant velocity = √(40² + 30²) = 50 m/s.
7. If a lift of mass 500 Kg moves upward with acceleration 2 m/s then the tension is:
[BP 2012]
5900
5800
6100
None
(a) Tension T = m(g + a) = 500 * (9.8 + 2) = 5900 N.
8. A body moves along with constant acceleration. Then its graphical representation will be:
[BP 2011]
() A velocity-time graph will be a straight line with a non-zero slope.
9. A vehicle climbs a hill at speed of 40 km/hr and returns to same place at speed 60 km/hr. What is the average speed for whole journey?
10. A man intends to cross a river on a boat with velocity 4 m/s. If resultant velocity of boat is 5 m/s. Then velocity of river is:
[BP 2010]
3 m/s
3 sqrt(2) m/s
4 m/s
512 m/s
(a) Velocity of river = √(5² - 4²) = 3 m/s.
11. Which of the following speed time graph is not possible?
[BP 2009]
() A speed-time graph cannot show instantaneous changes in speed.
12. The slope of a velocity- time graph gives
[MOE 2014]
Acceleration
Displacement
Uniform speed
Stationary object
(a) The slope of a velocity-time graph represents acceleration.
13. Two bodies, one held I'm above the other directly, are released simultaneously and fall freely under gravity. After 3 second their relative separation will be
[MOE 2013]
0.98 m
1 m
4.9 m
9.8 m
(b) Their relative separation remains constant at 1 m as they experience the same acceleration.
14. Time taken by a train of length 150 m and traveling with a uniform velocity of 6 km/hr to cross completely a bridge of length 1.5 km will be:
[MOE 2013, MOE 2012]
9s
9.9 s
90 s
99s
(d) Total distance = 1650 m, Speed = 5/3 m/s, Time = 990 s. Assuming typo in speed as 60 km/hr gives 99 s.
15. A body is thrown vertically upward and attains a velocity 15 m/s at half the maximum height. The maximum height upto the body can reach will be:
[MOE 2012, MOE 2011]
45.8 m
34.5 m
22. 9 m
17.8 m
(c) Using v² = u² - 2gh, H ≈ 22.9 m.
16. A body A is moving in north with 3 km/s and B with 4 km/s east. What is the relative velocity of a body A with respect to B.
[MOE 2011]
5 km/s west of north.
5 km/s east of north
5 km/s toward north
5 km/s toward west.
(a) Relative velocity = √(3² + 4²) = 5 km/s, direction West of North.
17. A body moves 30m due north, 20m due east and 30sqrt(2) due south west. The total displacement covered by body from its initial position is:
[I.E 2011]
14 m S - W
28 m south
10m west
18 m south
(c) Total displacement = -10m West.
18. Two bodies of mass '2 m' and 'm' are released from height '2H' and 'H' respectively. The ratio of time taken by
them to reach the ground is:
[I.E 2011]
1/4
1
Sqrt(2)
2
(c) Ratio of time = √(2*2H/g) / √(2H/g) = √2.
19. Two ships A and B are 4 km apart. A due west of B. If A moves with uniform velocity of 6 km/hr due south, calculate the magnitude of the velocity of A relative to B.
[I. E 2013]
5 km/hr
10 km/hr
15 km/hr
20 km/h
() Insufficient information to answer.
20. A body of mass 200 gm is thrown upwards with initial velocity of 30 m/s. What is total energy of body at height of 20 m from ground?
[IOM 2014]
50 J
100 J
40 J
90 J
(d) Total energy remains constant = 1/2 * 0.2 * 30² = 90 J.
21. A body travels with velocity 30 m/s for 1st half of time and with velocity 40 m/s for 2nd half of time then what would be average velocity.
[IOM 2013]
50 m/s
35 m/s
40 m/s
30 m/s
(b) Average velocity = (30 + 40) / 2 = 35 m/s.
22. A body cover 1/3 rd distance with V1, velocity next 2/3 rd distance with V2 velocity the average velocity.
[IOM 2012]
(2v1v2)/(v1+v2)
(V1+V2)/2
(V1V2)/(3V2+2V1)
(V1V2)/(V2+2V1)
(c) Average velocity = 3V1V2 / (V2 + 2V1). Option c has denominator 3V2 + 2V1 which is incorrect.
23. A person weighting 80 kg is standing on lift moves upward with a uniform acceleration of 4.9 m/s^2 then apparent wt. of the person is:
[KU 2013, KU 2012]
80 kg
60 kg
40 kg
120 Kg
(d) Apparent weight = m(g + a) = 80 * (9.8 + 4.9) ≈ 120 kg.
24. Two stones A and B are thrown from the top of a tower. The stone A is thrown vertically upward while the stone B is thrown vertically downward with the same speed. Which one of the following statements is true?
[KU 2012]
Stone A strikes the ground with higher velocity than B.
Stone B strikes the ground with higher velocity than A.
Both A and B strike the ground with same velocity.
A reaches the ground earlier than B.
(c) Both will strike the ground with the same speed due to conservation of energy.
25. A meter rod pivoted at its one end is rotated through 120degree. Then displacement of its free end will be.
[IOM]
2m
(2\pi)/3 m
Sqrt(2) m
Sqrt(3) m
(d) Displacement = √3 m.
26. A person turns left or right by 90 after travelling each 20m in straight line. What is his maximum displacement after three successive turns?
20 sqrt(5) m
40 sqrt(5) m
40 sqrt(2) m
80 m
(a) Maximum displacement = 20√5 m.
27. A person travels 3km towards north then 2km towards east and finally 2 sqrt(2) south-west. What is his displacement?
[BPKIHS]
Sqrt(2) km north east
1 km north
Sqrt(2) km south west
zero
(b) Displacement = 1 km North.
28. A flying kite travels 24m east then 8m south and finally 6m upward. What is its displacement from initial position?
30 m
26 m
16 m
40 m
(b) Displacement = √(24² + 8² + 6²) = 26 m.
29. A racing car moving along circular track of radius R at constant speed v has described angle \theta about centre of the track n certain time. What is the average velocity for the interval of time?
V
v/\theta
(V sin (\theta /2))/2
(2V sin (\theta /2))/\theta
(d) Average velocity = (2V sin(θ/2)) / θ.
30. A car travelling along circular track at constant speed 20m/s has completed half revolution on the track. Its average velocity will be [IOM/MOE/KU]
[IOM, MOE, KU]
10\pie m/s
20/\pie m/s
20 m/s
40/\pie m/s
(d) Average velocity = 40/π m/s.
31. The length of a second hand in a watch is 1cm. The change in velocity in 15sec is
(π/30sqrt(2)) cm/s
(π/30) cm/s
0
(π sqrt(2))/30 cm/s
(a) Change in velocity magnitude = π/(30√2) cm/s.
32. If the displacement of a body is proportional to square of time. Then body has
33. The displacement of a particle moving in a straight line at any instant time t is given as x = t^2 + 20 (in metre). What is its average velocity for first four seconds?
4m/s
6m/s
8m/s
10 m/s
(a) Average velocity = 4 m/s.
34. In the above question, what is its velocity at 4 second?
4m/s
6m/s
8 m/s
10 m/s
(c) Velocity at t=4 s is 8 m/s.
35. The acceleration of a particle at any instant of time 't' which starts from origin at initial velocity 2m/s is a = 2t (in m/s^2). What is its velocity in 5 seconds?
[I.E]
52 m/s
50 m/s
27 m/s
25 m/s
(c) Velocity at t=5 s is 27 m/s.
36. A train of 150 meter length is going towards north direction at a speed of 1 m/sec. A parrot flies at the speed of 5m/sec towards south direction parallel to the railway track. The time taken by the parrot to cross the train is
12 sec
8 se
15 sec
10 sec
(d) Time taken = 25 s (calculated as 150 / (5+1)). None of the options match this. If train speed is 5 m/s, time = 15 s. If train speed is 10 m/s, time = 10 s.
37. Two boys start running towards each other from two points, they are 120m apart. One runs with a speed of 5m/s and other with a speed of 7m/s. When and where do they meet each other from 1st point?
10s, 50m
10s, 70n
24s, 50m
17s, 70m
(a) They meet after 10 s at a distance of 50 m from the first point.
38. A train of length 200m travelling at 30m/sec overtakes another train of length 300m travelling at 20m/sec. The time taken by first train to pass the second is
30s
10sec
50 sec
40 sec
(c) Time taken to pass = 50 s.
39. An insect crawls a distance of 4m along north in 10seconds and then a distance of 3m along east in 5 seconds. The average velocity of the insect is:
7/15m/s
1/5 m/sec
5/15 m/sec
12/15 m/sec
(c) Average velocity = 1/3 m/s or 5/15 m/s.
40. A vehicle moving along a straight road covers half distance of its journey a 40km/hr and next half distance at 60km/hr in same direction. The average velocity for entire journey is
[IOM, MOE, KU, BPKIHS]
45 km/hr
48 km/hr
54 km/hr
50 km/h
(b) Average velocity = 48 km/hr.
41. A vehicle moving along a straight road travels for half time at 40 km/hr and then travels for next half time at 60 km/hr. The average velocity for entire journey is
[IOM, MOE, I.E, KU, BPKIHS]
50 km/hr
48 km/
54 km/hr
45 km/h
(a) Average velocity = 50 km/hr.
42. A body moving in a straight line travels 2m/s for first half distance and second half distance is covered in two equal time intervals at 4m/s and 2m/s. What is its average velocity for entire journey?
2.25 m/s
2.40 m/s
2.50 m/s
2.60 m/s
(b) Average velocity = 2.40 m/s.
43. A body moving in a straight line travels 2m/s for first half time and for second half time it covers equal distance at velocities 4m/s and 2m/s. What is its average velocity for entire journey?
7/3 m/s
8/3 m/
3 m/s
21/4 m/s
(a) Average velocity = 7/3 m/s.
44. A person travels certain distance x due east at constant velocity v, and then he travels equal distance x due north at constant velocity v2. What is his average velocity for entire journey?
[IOM, MOE]
(2V1V2)/(v1+v2)
Sqrt((v1^2+v2^2)/2)
(sqrt(2) v1V2)/(v1+v2)
1/2 (\sqrt(v1^2+v2^2))
(d) Magnitude of average velocity = 1/2 √(v1² + v2²).
45. A person travels for certain time t due east at constant velocity v, and then he travels for equal time t due north at constant velocity v2. What is his average velocity for entire journey?
[IOM]
(2V1V2)/(v1+v2)
Sqrt((v1^2+v2^2)/2)
(sqrt(2) v1V2)/(v1+v2)
1/2 (\sqrt(v1^2+v2^2))
(d) Magnitude of average velocity = 1/2 √(v1² + v2²).
46. The displacement of a particle is given by x = 2 -5t + 6t^2 where x is in meters and t in seconds. The initial velocity of the particle
- 5m/
- 3m/s
6 m/s
3m/s
(a) Initial velocity = -5 m/s.
47. If x denotes displacement in time t, and x = a cost, the acceleration is
a cost
- a cost
a sint
- a sint
(b) Acceleration = -a cost.
48. A car travelling due east at 20m/s turns towards north without changing speed in 10sec. The average acceleration of the car for its turn is
2 sqrt(2) m/s^2 north-east
2 sqrt(2) m/s^2 north-west
4m/s^2 due east
Zero
(b) Average acceleration = 2√2 m/s² North-West.
49. In the above question if the car makes 'U' turn then average acceleration of the car will be
2 sqrt(2) m/s^2 north-east
2 sqrt(2) m/s^2 north-west
4m/s^2 due east
Zero
(c) Average acceleration = 4 m/s² West (option c has east which is incorrect direction).
50. A car travelling due north at 30km/hr turns west and travels at the same speed, the change in velocity of car is
[MOE 2066]
30 km/hr north-west
60 km/hr south-west
30 sqrt(2) km/hr south-west
30 sqrt(2) km/hr north-cast
(c) Change in velocity = 30√2 km/hr South-West.
51. A body starts from rest and moves at constant acceleration a in a straight line for time t1, covering a distance x1, and then it retards at rest at constant deceleration b for time t2 covering a distance X2. Then average velocity will be
((ab)/(a+b)) t
((ab)/(2(a+b))) t
(2ab)/(a+b)
(sqrt(a^2+b^2)) t
(b) Average velocity = abT / 2(a+b). T = t₁ + t₂.
52. A stone is dropped from the top of a tower. If it reaches the earth in 6 seconds, the height of the tower is nearly.
[BPKIHS-07]
360m
180 m
100m
60m
(b) Height of tower ≈ 180 m.
53. A car accelerates from rest at constant rate for the first 10seonds and covers a distance x. It covers a distance y in the next 10 seconds at the same acceleration. Which of the velocity is true?
[BPKIHS]
y = 3x
X=3y
x=y
y = 2x
(a) y = 3x.
54. A car accelerates at a constant rate a1 for time t1 and then retards at the constant
rate a2 for time t2 and comes to rest t1/t2 =
(a1/a2)
A2/a1
(a1/a2)^2
(a2/a1)^2
(b) t₁/t₂ = a₂/a₁.
55. A person is throwing balls into the air one after the other. He throws the second ball when first ball is at the highest point. If he is throwing two balls every second, how high do they rise?
5m
3.15 m
2.5m
1.25m
(c) Maximum height ≈ 1.25 m.
56. A ball is dropped from the top of a tower 100m high. Simultaneously, another ball is thrown upwards with a speed of 50m/s. After what time do they cross each other?
1s
2s
3s
4s
(b) They cross each other after 2 s.
57. The engine of a motorcycle can produce a maximum acceleration 5m/s. Its brakes can produce a maximum retardation 10 m/s^2. What is the minimum time in which it can cover a distance of 1.5 km?
5s
10s
15s
30s
(d) Minimum time = 30 s.
58. Two balls A and B are simultaneously projected from the top of a building at 10m/s upwards and 20m/s downwards respectively. Find out the separation between them 3sec after projection.
30 m
60m
90m
120m
(c) Separation between them = 90 m.
59. 59.A stone is dropped from a certain height which can reach the ground is 5 second. It is stopped after three second of its fall and then is again released. The total time taken by the stone to reach the ground will be
6s
6.5s
7s
7.5s
(c) Total time taken = 7 s.
60. A balloon is going upwards with velocity 12m/s. It releases a packet when it is a height of 65m from ground. How much time will the packet take to reach the ground
5s
6s
7s
8s
(a) Time taken by the packet to reach the ground = 5 s.
61. A car moving with a speed of 40km/hr can be stopped by applying brakes after at least 2m. If the same car is moving with speed of 80 km/hr, the minimum stopping distance is
8m
2m
4m
6m
(a) Minimum stopping distance = 8 m.
62. A ball is dropped from the top of a very high tower. Distance covered by it in last second of its motion equal to the distance covered by in first 3secs of its motion. Find the time of fall
5s
10s
4s
15s
(a) Time of fall = 5 s.
63. A ball thrown vertically upward covers equal distances in its fourth and fifth second. Then initial velocity of projection will be
20m/s
40m/s
25m/s
50m/s
(c) Initial velocity of projection ≈ 25 m/s (assuming g ≈ 5 m/s²).
64. A ball is projected vertically upwards from the ground. It is found at the same elevation at t = 3s and t = 7s after projection. Find the projection speed.
30m/s
50m/s
40m/s
70m/s
(b) Projection speed = 50 m/s (assuming g = 10 m/s²).
65. A stone is dropped from the top of a tower. If it covers 24.5m in the last second of its motion, the height of the tower is
44.1 m
49m
78.4m
72m
(a) Height of the tower ≈ 44.1 m.
66. A body is projected vertically upward from point A, the top of a tower. It reaches the ground in t1 secs. If it is projected vertically downwards from A with the same velocity, it reaches the ground in t2 secs. If it falls freely from A, it would reach the ground in
(t1+t2)/2 secs
(t1-t2)/2 secs
T1t2 secs
Sqrt(t1t2) secs
(d) Time taken for free fall = √(t₁t₂).
67. A body is released from top of a smooth inclined plane having inclination 30degree and takes 3secs to reach the bottom. If the angle of inclination is doubled keeping the height same, what will be the time taken for the same process?
3 sec
Sqrt(3) sec
3sqrt(3) sec
1.5 sec
(b) Time taken = √3 sec.
68. A body sliding on a smooth inclined plane requires 4 seconds to reach the bottom, starting from rest at the top. How much time does it take to cover one-fourth distance starting from rest at the top?
[KU]
1s
2s
4s
16s
(b) Time taken to cover one-fourth distance = 2 s.
69. A ball is dropped from the top of a building and its time of fall is 't'. In the last 1/4^th time of its fall, it travels 1.4 metres. Find out the height of the building
5.6 m
7.2m
3.2m
16m
(c) Height of the building = 3.2 m.
70. A ball is projected vertically upwards from ground and its time of rise is 't'. In first t/5 time, it covers a distance of 2.7m. Find the height
12.5m
6m
25m
7.5m
(d) Height = 7.5 m.
71. A body is thrown upwards with velocity 100m/s and it travels 5m in the last second of its upward journey. If the same body is thrown upwards with velocity 200m/s, what distance will it travel in the last second of upward journey?
5m
10m
20m
25m
(a) Distance travelled in the last second remains the same (5m) as it only depends on g.
72. A body falls freely from rest and has velocity v after it falls through a height h. The distance it has to fall down further for its velocity to become double is
h
2h
3h
4h
(c) Further distance = 3h.
73. A ball dropped downwards. After 1 second another ball is dropped downwards from the same point. What is the distance between them 3seconds after the first ball was dropped?
25m
20m
50m
9.8m
(a) Distance between them = 25 m.
74. Two bodies are thrown vertically upward with their initial velocities in ratio 2: 3. Then the ratio of maximum heights attained by them is
Sqrt(2): sqrt(3)
2:3
4: 9
8: 27
(c) Ratio of maximum heights = (2/3)² = 4/9.
75. A lion chases a deer 30m ahead of it and gains 3m in as alter the chase started. After 10s, the distance between them is
16m
17m
18m
12m
() The question is unclear, assuming gain of 3m every second, the distance will be 0m.
76. A ball A is thrown vertically upward at initial speed u while another B is dropped from a height at the same instant. After time t, their relative velocity w.r.t one another will be
U
2gt
2gt-u
U-2gt
(a) Relative velocity = u.
77. A stone dropped from a height covers 5/9 part of total distance in last second. Then initial height will be
a. 30m
60m
90m
d. 45m
(d) Initial height = 45 m.
78. Water drops are falling at regular intervals of time from a roof 5m high. When first drop strikes the ground, third drop just leaves the roof then height of the second drop from the ground at this
instant is
1.25m
2.5m
3.75m
4m
(c) Height of the second drop from the ground = 3.75 m.
79. A body thrown vertically upwards attains a maximum height H. While moving upwards if it covers first (3H/4) distance from the ground in time T, then time taken to cover remaining distance H/4 will be
[IOM, MOE, KU, BPKIHS]
T
T/2
T/3
3T/4
(a) Time taken to cover remaining distance = T.
80. When a ball is thrown upwards with air resistance not neglected, it takes 10seconds to reach a height. It then returns to ground in time.
[MOE]
8.2s
6s
10s
12.4s
(a) Time to return will be less than 10 s, so 8.2 s is a likely answer.
81. A bullet loses 1/20 of its velocity after penetrating a plank. How may planks are required to stop the bullet?
6
9
11
13
(c) Number of planks required ≈ 11.
82. Three particles A, B and C are situated at the vertices of an equilateral triangle ABC of side l at t = 0. Each of the particle moves with constant speed v. A always has its velocity along AB, B along BC and C along CA. At what time will these particles meet each other?
(2l/3v)
(l/v)
(3l/4v)
Never
(a) Time to meet = 2l / 3v.
83. A vehicle moving at constant acceleration along a straight road has velocities u and v at two point A and B on the road. Then it velocity at midway between A and B will be
(2uv)/(u+v)
Sqrt((u^2+v^2)/2)
1/2 (\sqrt(v1^2+v2^2))
(u+v)/2
(b) Velocity at midway = √((u² + v²)/2).
84. A person who can swim at 5km/hr in still water, crosses a river 1 km wide flowing at 3km/hr along shortest route. Then time taken to cross the river is
10min
15min
20min
12m
(b) Time taken = 15 min.
85. A person who can swim at 12km/hr in still water wants to cross a river flowing at 6km/hr along shortest route. Then he has to start swimming at
a. 60° with stream
b. 90° with the stream
c. 120° with the stream
150° with the stream
(c) Angle with the stream = 150°.
86. A person who can swim at 5km/hr in still water cross a river 1km wide flowing at 3km/hr in shortest time. How far he will reach at another bank?
1 km
600m
800m
1200m
(b) Distance drifted = 600 m.
87. To a person running due east at 8km/hr raindrops appear to fall vertically downward at 6km/hr. Then actual velocity of raindrops is
a. 10km/hr at an angle tanarc(3/4) with vertical from east to west
b. 10km/hr at an angle tanarc(3/4) with vertical from west to east
10km/hr at an angle, tanarc(4/3) with vertical from west to east
d. 10km/hr at an angle tanarc(4/3) vertical from east to west
(a) Actual velocity of raindrops = 10 km/hr at an angle tan⁻¹(4/3) with vertical from west to east. Option a has tanarc(3/4) which is incorrect.
88. A boat takes 2 hours to travel 8km and back in still water lake. If the velocity of water is 4km/hr, the time taken for going upstream of 8km and coming back is
2 hours
2 hours 40 minutes
1 hour 20 minutes
none
(b) Time taken = 2 hours 40 minutes (assuming speed in still water is 8 km/hr).
89. A stone is dropped from the top of a tower of height 'h'. It reaches the ground in 't' secs. The position of the stone after t/3 secs. will be ... from the ground
[IOM 063]
(3/4)h
h/9
(8/9) h
(1/4)h
(c) Position of the stone from the ground = 8h/9.
90. A stone is dropped from the top of tower of height h. After 1 second another stone is dropped from balcony 20 m below the top. Both reach the bottom simultaneously. What is the value of h?
[IOM 05]
3125 m
312.5 m
31.25 m
25.31 m
(c) Height of the tower ≈ 31.25 m.
91. A body of mass 'm' is released from height 'h' in time 't'. Then, acceleration is determined by:
[IOM 2015]
Height and time
Mass and time
Mass and height
Mass only
(a) Acceleration a = 2h/t².
92. When an aeroplane is moving with velocity 600km/h due east & return with 400km/hr,
then what is average speed if they travel same distance?
[KU 2016]
240
480
500
720
(b) Average speed = 480 km/hr.
93. A person is traveling at 4 m/s towards east. The rain is apparently falling vertically downwards with 3 m/s, then the actual velocity of rain is,
[IOM 2016]
3/4 m/s
5 m/s
4/3 m/s
7 m/s
(b) Actual velocity of rain = 5 m/s.
94. A train travels for 40 km with velocity of 80 km/hr and again it travels next 40 km with velocity of 40 km/hr. Then average speed of the train is
