ACME ACADEMY

WEEKLY EVALUATION TEST

Subject: Science
Time Limit: 20 Mins
Max Marks: 20 Marks
Student Name:
Roll Number:
Class / Sec:
Date:

GENERAL INSTRUCTIONS:

  1. All questions are compulsory. Carefully read all instructions before starting.
  2. The question paper contains 20 questions.
  3. There is no negative marking for incorrect answers.
  4. Use of mobile phones, smartwatches, or calculators is strictly prohibited during the exam.
1. In scientific terms, what are the two essential conditions required for work to be done on an object?
[1 Mark]
(A) The object must be heavy, and it must be lifted upwards.
(B) A force must act on the object, and the object must be displaced in the direction of the force.
(C) A person must apply muscular energy, and the object must accelerate.
(D) The force applied must be continuous, and the object must move at a uniform speed.
2. A boy tries to push a heavy, rigid wall for 15 minutes but the wall does not move. Scientifically, how much work has the boy done on the wall?
[1 Mark]
(A) Positive work, because he used up his internal muscular energy.
(B) Negative work, because the wall pushed him back.
(C) Zero work, because there is no displacement of the wall.
(D) Infinite work, because the force was continuously applied.
3. When a goalkeeper dives and catches a fast-moving football, stopping it from entering the goal, what kind of work does the goalkeeper do on the ball?
[1 Mark]
(A) Positive work, because the ball was successfully stopped.
(B) Zero work, because the ball's final velocity is zero.
(C) Negative work, because the force applied is in the direction opposite to the displacement of the ball.
(D) Undefined work, because the ball has a curved surface.
4. What does the work-energy theorem state?
[1 Mark]
(A) Work done on an object is completely lost as heat energy.
(B) Work done on an object is equal to the change in its energy.
(C) The energy of an isolated system is always zero.
(D) Energy can be created if enough work is done.
5. If the velocity of a moving car is doubled, how will its kinetic energy change?
[1 Mark]
(A) It will remain the same.
(B) It will double.
(C) It will become four times its original value.
(D) It will become half its original value.
6. A stretched rubber band of a slingshot can shoot a small stone forward. What type of energy is stored in the stretched rubber band due to its deformed shape?
[1 Mark]
(A) Kinetic energy
(B) Thermal energy
(C) Potential energy
(D) Chemical energy
7. If an object of mass 5 kg is raised to a height of 2 m above the ground, what is its gravitational potential energy? (Assume g = 10 m/s²)
[1 Mark]
(A) 10 J
(B) 50 J
(C) 100 J
(D) 25 J
8. As an object falls freely towards the Earth, what happens to its mechanical energy (assuming no air resistance)?
[1 Mark]
(A) Its kinetic energy decreases while potential energy increases.
(B) Its total mechanical energy decreases continuously.
(C) Its potential energy decreases, its kinetic energy increases, but its total mechanical energy remains constant.
(D) Its total mechanical energy becomes zero halfway down.
9. In a simple pendulum, at which position does the bob possess maximum kinetic energy and zero potential energy?
[1 Mark]
(A) At its extreme positions (highest points)
(B) At the point where the string is cut
(C) At its lowest point (mean position)
(D) Exactly halfway between the mean and extreme positions
10. Power is defined as the:
[1 Mark]
(A) Total work done multiplied by time.
(B) Rate at which work is done.
(C) Force applied over a distance.
(D) Maximum capacity to store energy.
11. A machine does 1500 J of work in 5 seconds. What is the power of the machine?
[1 Mark]
(A) 300 W
(B) 7500 W
(C) 150 W
(D) 30 W
12. What is the fundamental purpose of using a simple machine like a fixed pulley or an inclined plane?
[1 Mark]
(A) To reduce the total amount of work done.
(B) To create extra energy out of nothing.
(C) To make work easier by changing the magnitude or direction of the applied force.
(D) To decrease the mechanical advantage to zero.
13. How does a fixed pulley make lifting a bucket of water easier?
[1 Mark]
(A) It reduces the magnitude of the required force to half.
(B) It makes the bucket weightless.
(C) It changes the direction of the effort downwards, which is more convenient than pulling upwards.
(D) It increases the potential energy of the bucket automatically.
14. In simple machines, the ratio of the load (force to be overcome) to the effort (force applied) is known as:
[1 Mark]
(A) Power efficiency
(B) Mechanical advantage
(C) Kinetic ratio
(D) Gravitational constant
15. Why is pushing a heavy box up a gentle, long inclined plane easier than lifting it vertically up to the same height?
[1 Mark]
(A) The inclined plane reduces the total work done on the box.
(B) The effort force required is smaller, although it has to be applied over a larger distance.
(C) The box loses mass when placed on an incline.
(D) The inclined plane reduces the potential energy gained by the box.
16. Assertion (A): A lever can help lift a heavy load using a much smaller effort force. Reason (R): In a lever, the total work done by the effort is always much greater than the work done on the load.
[1 Mark]
(A) Both A and R are true, and R is the correct explanation of A.
(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
17. In a Class I lever like a seesaw, how can a lighter child balance a much heavier adult?
[1 Mark]
(A) The lighter child must sit exactly at the fulcrum.
(B) The heavier adult must sit further away from the fulcrum.
(C) The lighter child must sit at a larger distance (longer effort arm) from the fulcrum than the adult.
(D) A seesaw cannot balance unequal weights.
18. An object of mass 'm' is moving with a velocity 'v'. The work required to bring the object to rest is equal to:
[1 Mark]
(A) mv
(B) mgh
(C) 1/2 mv^2
(D) 2mv^2
19. A traditional watermill (gharat) in the Himalayas grinds grain using flowing water. What is the primary sequence of energy transformation taking place?
[1 Mark]
(A) Chemical energy to Thermal energy to Mechanical energy
(B) Potential energy of water to Kinetic energy to Rotational (Mechanical) energy of the wheel
(C) Electrical energy to Kinetic energy
(D) Thermal energy to Potential energy
20. Consider a force-displacement graph where the force is constant. How can the work done be calculated from this graph?
[1 Mark]
(A) By finding the slope of the line.
(B) By finding the area under the force-displacement graph between the initial and final positions.
(C) By multiplying the maximum force by the total time.
(D) By dividing the force intercept by the displacement intercept.
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