In Young's double slit experiment how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if λ = 2000
and d = 7000
|
(a) 12 |
(b) 7 |
(c) 18 |
(d) 4 |
(b) 7
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At what temperature will the resistance of a copper wire become three times its value at 0 oC (Temperature coefficient of resistance for copper = 4 × 10–3 per oC )
|
(a) 400 oC |
(b) 450 oC |
(c) 500 oC |
(d) 550 oC |
Three equal resistances each of value R are joined as shown in the figure. The equivalent resistance between M and N is
|
(a) R |
(b) 2R |
(c) |
(d) |
A person using a lens as a simple microscope sees an:
Which logic gate is represented by the following combination of logic gates
|
(a) OR |
(b) NAND |
(c) AND |
(d) NOR |
An electric dipole of moment 
placed in a uniform electric field 
has minimum potential energy when the angle between and is
|
(a) Zero |
(b) |
(c) π |
(d) |
Curie is a unit of
|
(a) Length |
(b) It is not any unit |
(c) Activity |
(d) Atomic number |
Two insulated metallic spheres of 3 μF and 5 μF capacitances are charged to 300 V and 500V respectively. The energy loss, when they are connected by a wire is
|
(a) 0.012 J |
(b) 0.0218 J |
(c) 0.0375 J |
(d) 3.75 J |
In a dc motor, induced e.m.f. will be maximum
|
(a) When motor takes maximum speed |
(b) When motor starts rotating |
|
(c) When speed of motor increases |
(d) When motor is switched off |
