NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1939 - 1943 of 2144
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Question number: 1939
» Gravitation » Energy
Question
A body of mass 250 kg falls on the earth from infinity. What will be its energy on reaching the earth? Radius of the earth is 6400 km and g = 9.8 m/s 2. Air friction is negligible.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 1.56 ⨯ 10 10 J |
|
| b. | 2.27 ⨯ 10 10 J |
|
| c. | 2.54 ⨯ 10 9 J |
|
| d. | 1.27 ⨯ 10 9 J |
|
Question number: 1940
» Gravitation » Orbital Velocity of a Satellite
Question
The speed with which the earth have to rotate on its axis so that a person on the equator would weigh the as much as present will be - (Take the equatorial radius as 6400 km. )
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 7.28 ⨯ 10 -3 rad/sec |
|
| b. | 3 28 ⨯ 10 -3 rad/sec |
|
| c. | 3 28 ⨯ 10 -4 rad/sec |
|
| d. | 7.83 ⨯ 10 -4 rad/sec |
|
Question number: 1941
» Rotational Motion » Values of Moments of Inertia
Question
A flywheel rotating about a fixed axis has a kinetic energy of 380 J, when its angular speed is 35 rad s -1. The moment of inertia of the wheel about the axis of rotation is,
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 0.8 kg m 2 |
|
| b. | 0.75 kg m 2 |
|
| c. | 0.15 kg m 2 |
|
| d. | 0.62 kg m 2 |
|
Question number: 1942
» Rotational Motion » Values of Moments of Inertia
Question
A cylinder of 500 g and radius 10 cm has moment of inertia (about its natural axis)
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 2.5 ⨯ 10 -3 kg-m 2 |
|
| b. | 2 ⨯ 10 -3 kg-m 2 |
|
| c. | 3.5 ⨯ 10 -3 kg-m 2 |
|
| d. | 5 ⨯ 10 -3 kg-m 2 |
|
Question number: 1943
» Rotational Motion » Values of Moments of Inertia
Question
Three particles of mass 1.5 kg are attached to the rim of a circular disc of radius 0.2 m & negligible mass. Moment of inertia of die system about an axis passing through the center of the disc & perpendicular to its plane is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 2.2 kg-m 2 |
|
| b. | 0.18 kg-m 2 |
|
| c. | l kg-m 2 |
|
| d. | 0.24 kg-m 2 |
|