1.A stone is thrown vertically upwards with an initial speed u. If g is the...

1.A stone is thrown vertically upwards with an initial speed u. If g is the acceleration due to gravity, the stone will return to the starting point after time
A. u/g
B. ug
C. 2u/g
D. ug/2
E. 2ug
2. A body is dropped from rest at a height of 80m. How long does it take to reach the ground? (g=10ms⁻², ignore air resistance).
A. 2.0s
B. 4.0s
C. 8.0s
D. 16.0s
E. 32 0s
3. A particle is projected vertically with a velocity of 20ms⁻². What maximum height does it attain? (Take g=10ms⁻²)
A. 2000m
B. 200m
C. 20m
D. 2m
E. 0.2m
4. A body is projected vertically upwards with a velocity of 200ms⁻¹. How long does it take to return to the point of projection? (g=10ms⁻²)
A. 2s
B. 4s
C. 10s
D. 20s
E. 40s
5. A body moving with a velocity of 4ms⁻¹ is brought to rest by a constant force after travelling 20m. Calculate the retardation
A. 0.1ms⁻²
B. 0.2ms⁻²
C. 0.4ms⁻²
D. 2.5ms⁻²
E. 5.0ms⁻²
6. A body starts from rest and moves with constant acceleration. Which of the following quantities varies/vary linearly with the square of the time?
I. Velocity II. Displacement III. Momentum
A. I only
B. II only
C. III only
D. I and II only
E. II and III only
7. A body which is uniformly retarded comes to rest in 10s after travelling a distance of 20m. Calculate its initial velocity
A. 0.5ms⁻¹
B. 2.0ms⁻¹
C. 4.0ms⁻¹
D. 20.0ms⁻¹
E. 200.0ms⁻¹
8.A force of 21.0N acts on a particle of mass 3.0kg in a medium whose resistance is 2.0Nkg⁻¹. Calculate the acceleration of the particle
A. 5.00ms⁻²
B. 6.00ms⁻²
C. 6.33ms⁻²
D. 7.00ms⁻²
E. 7.66ms⁻²
9. The time of free fall of a body at a given place when air resistance is ignored depends on I. the mass of the body. II. the shape of the body III. the height from which the body falls
A. I only
B. II only
C. III only
D. I and II only
E. I, II and III
10. An air force jet flying with a speed of 335ms⁻¹ went past an anti-aircraft gun. How far is the aircraft 5s later when the gun was fired?
A. 838m
B. 3350m
C. 670m
D. 1675m
E. 67m
11. A body moving at 20ms⁻¹ decelerates uniformly at 5ms⁻² till its speed becomes 10ms⁻¹. The distance covered within this period is
A. 30m
B. 20m
C. 50m
D. 60m
12. A car has an initial velocity of 40ms⁻¹ and retards at 3ms⁻². Calculate its velocity after 10s.
A. 10ms⁻¹
B. 4ms⁻¹
C. 40ms⁻¹
D. 20ms⁻¹
13. A train with an initial velocity 20ms⁻¹ is subjected to a uniform deceleration of 2ms⁻². The time required to bring the train to a complete halt is
A. 20s
B. 40s
C. 10s
D. 5s
14. A car accelerates uniformly from rest at 3ms⁻², its velocity after travelling a distance of 24m is
A. 72ms⁻¹
B. 36ms⁻¹
C. 12ms⁻¹
D. 144ms⁻¹
15. A car with an initial velocity of 20ms⁻¹ is subjected to a uniform. deceleration of 2ms⁻². The time required to bring the car to a complete halt is
A. 5s
B. 10s
C. 20s
D. 40s

16. A car starts from rest and moves with a uniform acceleration of 30ms⁻² for 20s. Calculate the distance covered at the end of motion
A. 6km
B. 12km
C. 18km
D. 24km
17. Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms⁻¹ with a constant retardation of 0.1ms⁻².
A. 5500m
B. 4500m
C. 4200m
D. 3000m
18. If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?
A. 45m
B. 60m
C. 90m
D. 30m
19. A car moves with an initial velocity of 25ms⁻¹ and reaches a velocity of 45ms⁻¹ in 10s. What is the acceleration of the car?
A. 5ms⁻²
B. 25ms⁻²
C. 20ms⁻²
D. 2ms⁻²
20. A stone and a feather are dropped from the same height above the earth surface. Ignoring air resistance, which of the following is correct?
A. The stone and feather will both reach the ground first at the same time
B. The stone will reach the ground first
C. The feather will reach the ground d first
D. The feather will be blown away by the wind while the stone will drop steadily
21. A bullet fired vertically upward from a gun held 2.0m above the ground reaches its maximum height in 4.0s. Calculate its initial velocity (g=10ms⁻²)
A. 10ms⁻¹
B. 8ms⁻¹
C. 40ms⁻¹
D. 20ms⁻¹
22. A car accelerate uniformly from rest at 4ms⁻². How far will it travel in the fifth complete second?
A. 100m
B. 50m
C. 32m
D. 18m
23. A body initially at rest falls freely under gravity. If g=10ms⁻², the distance covered by the body in the fourth second of fall is
A. 35m
B. 40m
C. 45m
D. 80m
24. A body accelerated uniformly from rest covers a distance of 8m in 2 seconds. The distance covered in the third second is
A. 18m
B. 12m
C. 10m
D. 4m
25. A motorcyclist travelling at 30ms⁻¹ starts to apply his brakes when he is 50m from the traffic light that had just turned red. If he reached the traffic light, his deceleration is
A. 5ms⁻²
B. 9ms⁻²
C. 10ms⁻²
D. 18ms⁻²
26. The velocity v of a particle in a time t is given by the equation: v = 10 2t². Find the instantaneous acceleration after 5 seconds.
A. 10ms⁻²
B. 15ms⁻²
C. 20ms⁻²
D. 60ms⁻²
27. In free fall, a body of mass 1kg drops from a height of 125m from rest in 5s. How long will it take another body of mass 2kg to fall from rest from the same height? (g=10ms⁻²)
A. 5s
B. 10s
C. 12s
D. 15s
28. The distance x(m) travelled by a particle in time t seconds is described by the equation : x = 10 12t². Find the average speed of the particle between the time interval t = 2s and t = 5s
A. 60ms⁻¹
B. 72ms⁻¹
C. 84ms⁻¹
D. 108ms⁻¹
29. A motor vehicle is brought to rest from a speed of 15ms⁻¹ in 20s. Calculate the retardation
A. 0.75ms⁻²
B. 1.33ms⁻²
C. 5.00ms⁻²
D. 7.50ms⁻²
30. An airplane lands in a run away at a speed of 180kmh⁻¹ and is brought to a stop uniformly in 30 seconds. What distance does it cover on the runway before coming to rest
A. 360m
B. 540m
C. 750m?

In Physics
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Asked by Trenourish on 24th January, 2024