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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In a potentiometer experiment two cells of e.m.f. E1 and E2 are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E2 is reversed, then the balancing length becomes 29 cm. The ratio 
of the e.m.f. of the two cells is
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(a) 1 : 1 |
(b) 2 : 1 |
(c) 3 : 1 |
(d) 4 : 1 |
The angle which subtends the periphery of the spherical mirror at the centre of curvature is called:
A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in
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(a) Reduction of charge on the plates and increase of potential difference across the plates |
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(b) Increase in the potential difference across the plate, reduction in stored energy, but no change in the charge on the plates |
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(c) Decrease in the potential difference across the plates, reduction in the stored energy, but no change in the charge on the plates |
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(d) None of the above |
In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)
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(a) Equal to 5Ω |
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(b) Greater from 5 Ω |
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(c) Less than 5 Ω |
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(d) Greater or less than 5 Ω depends on the material of R |
Which of the following quantities increase when wavelength is increased? Consider only the magnitudes.