If an interference pattern have maximum and minimum intensities in 36 : 1 ratio then what will be the ratio of amplitudes
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(a) 5 : 7 |
(b) 7 : 4 |
(c) 4 : 7 |
(d) 7 : 5 |
(d) 7 : 5
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A bar magnet of magnetic moment 200 A-m2 is suspended in a magnetic field of intensity 0.25 N/A-m. The couple required to deflect it through 30o is
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(a) 50 N-m |
(b) 25 N-m |
(c) 20 N-m |
(d) 15 N-m |
Two uniform wires A and B are of the same metal and have equal masses. The radius of wire A is twice that of wire B. The total resistance of A and B when connected in parallel is
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(a) 4 Ω when the resistance of wire A is 4.25 Ω |
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(b) 5 Ω when the resistance of wire A is 4.25 Ω |
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(c) 4 Ω when the resistance of wire B is 4.25 Ω |
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(d) 4 Ω when the resistance of wire B is 4.25 Ω |
A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown. The greatest distance over which he can see the image of the light source in the mirror is
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(a) d/2 |
(b) d |
(c) 2d |
(d) 3d |
When wavelength of incident photon is decreased then
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(a) Velocity of emitted photo-electron decreases |
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(b) Velocity of emitted photoelectron increases |
|
(c) Velocity of photoelectron do not charge |
|
(d) Photo electric current increases |
A finite ladder is constructed by connecting several sections of 2μF,4 μF capacitor combinations as shown in the figure. It is terminated by a capacitor of capacitance C. What value should be chosen for C such that the equivalent capacitance of the ladder between the points A and B becomes independent of the number of sections in between
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(a) 4μF |
(b) 2 μF |
(c) 18 μF |
(d) 6 μF |
A coil having N turns carry a current I as shown in the figure. The magnetic field intensity at point P is
|
(a) |
(b) |
(c) |
(d) Zero |
The charge on a capacitor of capacitance 10 μF connected as shown in the figure is
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(a) 20 μC |
(b) 15 μC |
(c) 10 μC |
(d) Zero |
Three identical capacitors are given a charge Q each and they are then allowed to discharge through resistance R1, R2 and R3. Their charges, as a function of time shown in the graph below. The smallest of the three resistance is
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(a) R3 |
(b) R2 |
(c) R1 |
(d) Cannot be predicted |
