Out of gravitational, electromagnetic, Vander Waals, electrostatic and nuclear forces; which two are able to provide an attractive force between two neutrons
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(a) Electrostatic and gravitational |
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(b) Electrostatic and nuclear |
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(c) Gravitational and nuclear |
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(d) Some other forces like Vander Waals |
(c) Gravitational and nuclear
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A battery of 6 volts is connected to the terminals of a three metre long wire of uniform thickness and resistance of the order of 100 Ω. The difference of potential between two points separated by 50 cm on the wire will be
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(a) 1 V |
(b) 1.5 V |
(c) 2 V |
(d) 3 V |
What physical quantities may X and Y represent ? (Y represents the first mentioned quantity)
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(a) Pressure v/s temperature of a given gas (constant volume) |
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(b) Kinetic energy v/s velocity of a particle |
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(c) Capacitance v/s charge to give a constant potential |
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(d) Potential v/s capacitance to give a constant charge |
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 |
10 gm of radioactive material of half-life 15 year is kept in store for 20 years. The disintegrated material is
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(a) 12.5 g |
(b) 10.5 g |
(c) 6.03 g |
(d) 4.03 g |
Assertion : If a charged particle is moving on a circular path in a perpendicular magnetic field, the momentum of the particle is not changing,.
Reason : Velocity of the particle in not changing in the magnetic field.
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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 the following Wheatstone bridge P/Q = R/S. If key K is closed, then the galvanometer will show deflection
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(a) In left side |
(b) In right side |
(c) No deflection |
(d) In either side |