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Q. No.A block of mass \(m\) slides down a smooth plane inclined at an angle of \(60^\circ\) with the horizontal. The normal reaction of the incline acting on the block equals:
1.
\(mg\sin60^\circ\)
2.
\(mg\cos60^\circ\)
3.
\(mg\tan60^\circ\)
4.
\(mg\cot60^\circ\)
Subtopic: Tension & Normal Reaction |
86%
From NCERT
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In order to stop a car in shortest distance on a horizontal road, one should:
| 1. | apply the brakes very hard so that the wheels stop rotating. |
| 2. | apply the brakes hard enough to just prevent slipping. |
| 3. | pump the brakes (press and release). |
| 4. | shut the engine off and not apply brakes. |
Subtopic: Friction |
69%
From NCERT
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If the tension in the cable supporting an elevator is equal to the weight of the elevator, the elevator may be:
| (a) | going up with increasing speed |
| (b) | going down with increasing speed |
| (c) | going up with uniform speed |
| (d) | going down with uniform speed |
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. all of the above
Subtopic: Tension & Normal Reaction |
85%
From NCERT
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A \(60\) kg man pushes a \(40\) kg man by a force of \(60\) N. The \(40\) kg man has pushed the other man with a force of:
| 1. | \(40\) N | 2. | \(0\) |
| 3. | \(60\) N | 4. | \(20\) N |
Subtopic: Newton's Laws |
72%
From NCERT
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The tension at the mid-point \(\mathrm{P}\) of the rope is:
(Consider the system is in equilibrium condition, mass of rope\(=4\) kg and \(g=10\) m/s2.)
1. \(100\) N
2. \(120\) N
3. \(140\) N
4. \(190\) N
(Consider the system is in equilibrium condition, mass of rope\(=4\) kg and \(g=10\) m/s2.)
1. \(100\) N
2. \(120\) N
3. \(140\) N
4. \(190\) N
Subtopic: Tension & Normal Reaction |
80%
From NCERT
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A disc revolves with a speed of \(0.5\) revolutions per second and has a radius of \(15\) cm. Two coins are placed at \(3\) cm and \(12\) cm away from the center. If the coefficient of friction between coins and the disc is \(0.2,\) then:
| 1. | coin at \(3\) cm will slip. |
| 2. | coin at \(12\) cm will slip. |
| 3. | both coins will slip. |
| 4. | no coin will slip. |
Subtopic: Friction |
From NCERT
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The system is at rest initially, due to the force of friction acting on \(A\). If the string connecting the lower blocks is cut, the accelerations of the blocks \(A\), \(B\) & \(C\) will be, respectively,
| 1. | \(\dfrac g 3\) to left, \(g\) upward, \(g\) downward. |
| 2. | zero, zero, \(g\) downward. |
| 3. | zero, \(g\) upward, \(g\) downward. |
| 4. | \(g\) to right, zero, \(g\) downward. |
Subtopic: Spring Force |
67%
From NCERT
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A boy pushes a box of mass \(2~\text{kg}\) with a force \(\vec{F} = (20 \hat{i} + 10 \hat{j} )~\text{N}\) on a frictionless surface. If the box was initially at rest, then the displacement along the \(x\text-\)axis after \(10~\text{s}\) is:
| 1. | \(250~\text{m}\) | 2. | \(400~\text{m}\) |
| 3. | \(500~\text{m}\) | 4. | \(750~\text{m}\) |
Subtopic: Newton's Laws |
82%
From NCERT
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When a body of mass \(m\) just begins to slide as shown, match List-I with List-II:
| List-I | List-II | ||
| (a) | Normal reaction | (i) | \(P\) |
| (b) | Frictional force \((f_s)\) | (ii) | \(Q\) |
| (c) | Weight \((mg)\) | (iii) | \(R\) |
| (d) | \(mg \mathrm{sin}\theta ~\) | (iv) | \(S\) |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (i) | (iii) | (iv) |
| 2. | (iv) | (ii) | (iii) | (i) |
| 3. | (iv) | (iii) | (ii) | (i) |
| 4. | (ii) | (iii) | (iv) | (i) |
Subtopic: Application of Laws |
86%
From NCERT
NEET - 2022
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Given below are two statements:
| Assertion (A): | Improper banking of roads causes wear and tear of tyres. |
| Reason (R): | The necessary centripetal force in that event is provided by the force of friction between the tyres and the road. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Banking of Roads |
69%
From NCERT
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