For a nucleus to be stable, the correct relation between neutron number N and Proton number Z is
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(a) N > Z |
(b) N = Z |
(c) N < Z |
(d) N ≥ Z |
(d) N ≥ Z
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Assertion : For cooking in a microwave oven, food is always kept in metal containers.
Reason : The energy of microwave is easily transferred to the food in metal container.
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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. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A 6μF capacitor is charged from 10 volts to 20 volts . Increase in energy will be
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(a) |
(b) 9 |
(c) 4.5 |
(d) 9 |
The magnetic flux linked with a coil at any instant ‘t’ is given by f = 5t3 – 100t + 300, the e.m.f. induced in the coil at t = 2 second is
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(a) – 40 V |
(b) 40 V |
(c) 140 V |
(d) 300 V |
Assertion : The magnetic filed at the ends of a very long current carrying solenoid is half of that at the center.
Reason : If the solenoid is sufficiently long, the field within it is uniform.
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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. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
In general, metallic ropes are suspended on the carriers which take inflammable material. The reason is
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(a) There speed is controlled |
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(b) To keep the centre of gravity of the carrier nearer to the earth |
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(c) To keep the body of the carrier in contact with the earth |
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(d) Nothing should be placed under the carrier |
A body can be negatively charged by
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(a) Giving excess of electrons to it |
(b) Removing some electrons from it |
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(c) Giving some protons to it |
(d) Removing some neutrons from it |
Positive rays consists of
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(a) Electrons |
(b) Neutrons |
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(c) Positive ions |
(d) Electro magnetic waves |
