Q. No.In the arrangement shown in the figure, the ends P and Q of an inextensible string move downwards with uniform speed u. Pulleys A and B are fixed. The mass M moves upwards with a speed
1. \(2u~cos\theta\)
2. \(u/cos\theta\)
3. \(2u/cos\theta\)
4. \(ucos\theta\)
When Neils Bohr shook hand with Werner Heisenberg, what kind of force they exerted?
1. Gravitational
2. Electromagnetic
3. Nuclear
4. Weak
1. \(N>E>G\)
2. \(E>N>G\)
3. \(G>N>E\)
4. \(E>G>N\)
The sum of all electromagnetic forces between different particles of a system of charged particles is zero
1. only if all the particles are positively charged
2. only if all the particles are negatively charged
3. only if half the particles are positively charged am half are negatively charged
4. irrespective of the signs of the charges
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 |
A neutron exerts a force on a proton which is
(a) gravitational
(b) electromagnetic
(c) nuclear
(d) weak
Choose the correct option:
1. (a) and (b)
2. (a) and (c)
3. (b) and (c)
4. (a) and (d)
A proton exerts a force on a proton which is:
(a) gravitational
(b) electromagnetic
(c) nuclear
(d) weak
Choose the correct option:
| 1. | (a), (b) and (c) | 2. | (b), (c) and (d) |
| 3. | (a) and (b) | 4. | (b) and (c) |
Mark the correct statements :
(a) The nuclear force between two protons is always greater than the electromagnetic force between them
(b) The electromagnetic force between two protons is always greater than the gravitational force between them
(c) The gravitational force between two protons may be greater than the nuclear force between them
(d) Electromagnetic force between two protons may be greater than the nuclear force acting between them
Choose the correct option:
1. (a), (b) and (c)
2. (b), (c) and (d)
3. (a), (b) and (d)
4. All of these
If all matter were made of electrically neutral particles such as neutrons,
(a) there would be no force of friction
(b) there would be no tension in the string
(c) it would not be possible to sit on a chair
(d) the earth could not move around the sun
Choose the correct option:
1. (a), (b) and (c)
2. (a), (c) and (d)
3. (b), (c) and (d)
4. All of these
Which of the following systems may be adequately described by classical physics?
| a. | motion of a cricket ball |
| b. | motion of a dust particle |
| c. | a hydrogen atom |
| d. | a neutron changing to a proton |
Choose the correct option:
| 1. | (a) and (b) |
| 2. | (b) and (c) |
| 3. | (c) and (d) |
| 4. | (a) and (d) |
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