Work, Energy and Power [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 25 - 30 of 230
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Question 25
Question MCQ▾
A body is acted upon by a force F = 2i + 1j + k. The work done by the force in displacing it from (0,0, 0) to (0,0, 4m) will be
Choices
Choice (4) | Response | |
---|---|---|
a. | 7 J | |
b. | 12 J | |
c. | 10 J | |
d. | 8 J |
Question 26
Question MCQ▾
A body is acted upon by a force F =-i + 2j + 3k. The work done by the force in displacing it from (0,0, 0) to (0,2, 4m) will be
Choices
Choice (4) | Response | |
---|---|---|
a. | 12 J | |
b. | 8 J | |
c. | 15 J | |
d. | 10 J |
Question 27
Question MCQ▾
A uniform rod of length 4 m and mass 20 kg is lying horizontal on the ground. The work done in keeping it vertical with one of its ends touching the ground, will be –
Choices
Choice (4) | Response | |
---|---|---|
a. | 784 J | |
b. | 98 J | |
c. | 392 J | |
d. | 196 J |
Question 28
Question MCQ▾
The work done in lifting water from a well of depth 6 m using a bucket of mass 0.8 kg and volume 1 liter, will be
Choices
Choice (4) | Response | |
---|---|---|
a. | 147 J | |
b. | 98 J | |
c. | 73.5 J | |
d. | 105.84 J |
Question 29
Question MCQ▾
A tennis ball dropped from a height of 3 m rebounds only 1.6 meter after hitting the ground. What fraction of energy is lost in the impact?
Choices
Choice (4) | Response | |
---|---|---|
a. | 1.26 | |
b. | 0.466 | |
c. | 2.45 | |
d. | 0.233 |
Question 30
Question MCQ▾
Choose the correct options -
(1) The work done by forces may be equal to change in kinetic energy
(2) The work done by forces may be equal to change in potential energy
(3) The work done by forces may be equal to change in total energy
(4) The work done by forces must be equal to change in potential energy.
Select the correct answers and mark it according to the following codes:
Choices
Choice (4) | Response | |
---|---|---|
a. | 1 and 3 are correct | |
b. | 1 and 2 are correct | |
c. | 1,2 and 3 are correct | |
d. | 2 and 4 are correct |