Question
In nuclear reaction 
A denotes
|
(a) Electron |
(b) Positron |
(c) Proton |
(d) Neutron |
In nuclear reaction A denotes
|
(a) Electron |
(b) Positron |
(c) Proton |
(d) Neutron |
(d) Neutron
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Assertion : The specific charge of positive rays is not constant.
Reason : The mass of ions varies with speed.
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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 man runs towards mirror at a speed of 15 m/s. What is the speed of his image
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(a) 7.5 m/s |
(b) 15 m/s |
(c) 30 m/s |
(d) 45 m/s |
In a double slit arrangement fringes are produced using light of wavelength 4800 Å. One slit is covered by a thin plate of glass of refractive index 1.4 and the other with another glass plate of same thickness but of refractive index 1.7. By doing so the central bright shifts to original fifth bright fringe from centre. Thickness of glass plate is
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(a) 8 mm |
(b) 6 mm |
(c) 4 mm |
(d) 10 mm |
In Thomson experiment of finding e/m for electrons, beam of electron is replaced by that of muons (particle with same charge as of electrons but mass 208 times that of electrons). No deflection condition in this case satisfied if
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(a) B is increased 208 times |
(b) E is increased 208 times |
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(c) B is increased 14.4 times |
(d) None of these |
What is immaterial for an electric fuse wire
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(a) Its specific resistance |
(b) Its radius |
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(c) Its length |
(d) Current flowing through it |