- AN/C.
- BJ/C.
- CV/m.
- DJ/Cm.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
An atom of mass number 15 and atomic number 7 captures an α - particle and then emits a proton. The mass number and atomic number of the resulting product will respectively be
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(a) 14 and 2 |
(b) 15 and 3 |
(c) 16 and 4 |
(d) 18 and 8 |
The dimensions of magnetic flux are
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(a) |
(b) |
(c) |
(d) |
A simple microscope has:
Assertion : If a proton and an electron are placed in the same uniform electric field. They experience different acceleration.
Reason : Electric force on a test charge is independent of its mass.
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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. |
Water boils in an electric kettle in 15 minutes after switching on. If the length of the heating wire is decreased to 2/3 of its initial value, then the same amount of water will boil with the same supply voltage in
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(a) 15 minutes |
(b) 12 minutes |
(c) 10 minutes |
(d) 8 minutes |
Which of the following electromagnetic waves have minimum frequency
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(a) Microwaves |
(b) Audible waves |
(c) Ultrasonic waves |
(d) Radiowaves |
A railway compartment is lit up by thirteen lamps each taking 2.1 amp at 15 volts. The heat generated per second in each lamp will be
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(a) 4.35 cal |
(b) 5.73 cal |
(c) 7.5 cal |
(d) 2.5 cal |