- Amakes geometry easier.
- Bshows minimum deflection.
- Cshow maximum intensity.
- ✓forms a point image of a point object.
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From the following equations, pick out the possible nuclear reactions
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(a) |
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(b) |
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(c) |
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(d) |
Assertion : A metal piece and a non-metal (stone) piece are dropped from the same height near earth’s surface. Both will reach the earth’s surface simultaneously.
Reason : There is no effect of earth’s magnetic field on freely falling body.
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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. |
AB is a potentiometer wire of length 100 cm and its resistance is 10 ohms. It is connected in series with a resistance R = 40 ohms and a battery of e.m.f. 2 V and negligible internal resistance. If a source of unknown e.m.f. E is balanced by 40 cm length of the potentiometer wire, the value of E is

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(a) 0.8 V |
(b) 1.6 V |
(c) 0.08 V |
(d) 0.16 V |
A charged particle is released from rest in a region of steady uniform electric and magnetic fields which are parallel to each other the particle will move in a
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(a) Straight line |
(b) Circle |
(c) Helix |
(d) Cycloid |
The equivalent resistance between x and y in the circuit shown is

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(a) 10 W |
(b) 40 W |
(c) 20 W |
(d) |
A charge particle is free to move in an electric field. It will travel
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(a) Always along a line of force |
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(b) Along a line of force, if its initial velocity is zero |
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(c) Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force |
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(d) None of the above |
White light may be considered to be a mixture of waves with l ranging between 3900 Å and 7800 Å. An oil film of thickness 10,000 Å is examined normally by reflected light. If m = 1.4, then the film appears bright for
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(a) 4308 Å, 5091 Å, 6222 Å |
(b) 4000 Å, 5091 Å, 5600 Å |
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(c) 4667 Å, 6222 Å, 7000 Å |
(d) 4000 Å, 4667 Å, 5600 Å, 7000Å |