- Gravitational.
- Electromagnetic.
- Nuclear.
- Weak.
Explanation:
A neutron exerts both the gravitational and nuclear forces on a proton.
The gravitational force can be seen between a neutron and a proton. However, its strength is negligible. The nuclear force is exerted only if the interacting particles are neutrons or protons or both. A neutron cannot exert electromagnetic force, because it is a neutral particle.
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For the network shown in the figure the value of the current i is
|
(a) |
(b) |
(c) |
(d) |
Intensity of X-rays depends upon the number of
|
(a) Electrons |
(b) Protons |
(c) Neutrons |
(d) Positrons |
Assertion : Two electric bulbs of 50 and 100 W are given. When connected in series 50 W bulb glows more but when connected parallel 100 W bulb glows more.
Reason : In series combination, power is directly proportional to the resistance of circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A body has – 80 micro coulomb of charge. Number of additional electrons in it will be
|
(a) 8 |
(b) 80 |
(c) 5 |
(d) 1.28 |
A dip needle in a plane perpendicular to magnetic meridian will remain
| (a) Vertical | (b) Horizontal |
| (c) In any direction | (d) At an angle of dip to the horizontal |
Approximate height of ozone layer above the ground is
|
(a) 60 to 70 km |
(b) 59 km to 80 km |
(c) 70 km to 100 km |
(d) 100 km to 200 km |
Two infinitely long parallel wires carry equal current in same direction. The magnetic field at a mid point in between the two wires is
|
(a) Twice the magnetic field produced due to each of the wires |
|
(b) Half of the magnetic field produced due to each of the wires |
|
(c) Square of the magnetic field produced due to each of the wires |
|
(d) Zero |