- Must be longitudinal
- May be longitudinal
- Must be transverse
- May be transverse.
Explanation:
Particles in a solid are very close to each other; thus. both longitudinal and transverse waves can travel through it.
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Assertion : Through the same current flows through the line wires and the filament of the bulb but heat produced in the filament is much higher then that in line wires.
Reason : The filament of bulbs is made of a material of high resistance and high melting point.
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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. |
The ratio of the energy of an X-ray photon of wavelength 1 Å to that of visible light of wavelength 5000 Å is
| (a) 1: 5000 | (b) 5000 : 1 | (c) 1 :25 × 106 | (d) 25 × 106 |
The magnetic induction at any point due to a long straight wire carrying a current is
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(a) Proportional to the distance from the wire |
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(b) Inversely proportional to the distance from wire |
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(c) Inversely proportional to the square of the distance from the wire |
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(d) Does not depend on distance |


Wavelength of light of frequency 100Hz
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(a) 2 |
(b) 3 |
(c) 4 |
(d) 5 |
A film projector magnifies a 100 cm2 film strip on a screen. If the linear magnification is 4, the area of magnified film on the screen is
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(a) 1600 cm2 |
(b) 400 cm2 |
(c) 800 cm2 |
(d) 200 cm2 |
In a wire of circular cross-section with radius r, free electrons travel with a drift velocity V when a current I flows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is 2V
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(a) 2I |
(b) I |
(c) I/2 |
(d) I/4 |
A copper disc of radius 0.1 m is rotated about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is
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(a) |
(b) |
(c) π |
(d) 2π |