Q. No.A car accelerates on a horizontal road due to the force exerted by
1. the engine of the car
2. the driver of the car
3. the earth
4. the road
Sorry!! currently, the explanation for the question is not provided. If you need further help, please email at support@neetprep.com with subject: Explanation Missing for Question Id: 302183
Sorry!! currently, the explanation for the question is not provided. If you need further help, please email at support@neetprep.com with subject: Explanation Missing for Question Id: 302183
A block of mass \(10\) kg is suspended through two light spring balances as shown in the figure:
| 1. | both the scales will read \(10\) kg. |
| 2. | both the scales will read \(5\) kg. |
| 3. | the upper scale will read \(10\) kg and the lower zero. |
| 4. | the readings may be anything but their sum will be \(10\) kg. |
A block of mass m is placed on a smooth inclined plane of inclination θ with the horizontal. The force exerted by the plane on the block has a magnitude
1. mg
2. mg/cosθ
3. mg cosθ
4. mg tanθ
A block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block has a magnitude:
1. mg
2. mg/cosθ
3. mg cosθ
4. mg tanθ
Neglect the effect of rotation of the earth. Suppose the earth suddenly stops attracting objects placed near its surface. A person standing on the surface of the earth will:
| 1. | fly up |
| 2. | slip along the surface |
| 3. | fly along a tangent to the earth’s surface |
| 4. | remain standing |
Three rigid rods are joined to form an equilateral triangle ABC of side 1 m. Three particles carrying charges 20 pC each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame. The resultant force on the charged particle at A has the magnitude.
1. zero
2. 3.6 N
3. \(36\sqrt 3\)N
4. 7.2 N
A force F1 acts on a particle so as to accelerate it from rest to a velocity v. The force F1 is then replaced by F2 which decelerates it to rest.
1. F1 must be equal to F2
2. F1 may be equal to F2
3. must be unequal to F2
4. none of these
Two objects \(A\) and \(B\) are thrown upward simultaneously with the same speed. The mass of \(A\) is greater than the mass of \(B\). Suppose the air exerts a constant and equal force of resistance on the two bodies.
| 1. | the two bodies will reach the same height. |
| 2. | \(A\) will go higher than \(B\). |
| 3. | \(B\) will go higher than \(A\). |
| 4. | any of the above three may happen depending on the speed with which the objects are thrown. |
A smooth wedge A is fitted in a chamber hanging from a fixed ceiling near the earth’s surface. A block B placed at the top of the wedge takes a time T to slide down the length of the wedge. If the block is placed at the top of the wedge and the cable supporting the chamber is broken at the same instant, the block will
1. take a time longer than T to slide down the wedge
2. take a time shorter than T to slide down the wedge
3. remain at the top of the wedge
4. jump off the wedge
In an imaginary atmosphere, the air exerts a small force F on any particle in the direction of the particle’s motion. A particle of mass m projected upward takes a time t1 in reaching the maximum height and t2 in the return journey to the original point. Then
1. t1 < t2
2. t1 > t2
3. t1 = t2
4. the relation between t1 and t2 depends on the mass of the particle
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