- ✓$\lambda$
- B$2 \lambda$
- C$6 \lambda$
- D$3 \lambda$
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To get an output 1 from the circuit shown in the figure, the input must be

|
(a) A = 0, B = 1, C = 0 |
(b) A = 1, B = 0, C = 0 |
(c) A = 1, B = 0, C = 1 |
(d) A = 1, B = 1, C = 0 |
Light waves producing interference have their amplitudes in the ratio 3 : 2. The intensity ratio of maximum and minimum of interference fringes is
|
(a) 36 : 1 |
(b) 9 : 4 |
(c) 25 : 1 |
(d) 6 : 4 |
A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to the one of the sides of the loop and is in the plane of the loop. If a steady current I is established in wire as shown in figure, the loop will
| (a) Rotate about an axis parallel to the wire |
| (b) Move away from the wire or towards right |
| (c) Move towards the wire |
| (d) Remain stationary |
If
are the lengths of the emitter, base and collector of a transistor then
|
(a) |
(b) |
(c) |
(d) |
A 2 volt battery, a 15 Ω resistor and a potentiometer of 100 cm length, all are connected in series. If the resistance of potentiometer wire is 5 Ω, then the potential gradient of the potentiometer wire is
|
(a) 0.005 V/cm |
(b) 0.05 V/cm |
(c) 0.02 V/cm |
(d) 0.2 V/cm |
If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power
|
(a) + 6.5D |
(b) – 6.5 D |
(c) + 7.5 D |
(d) – 0.75 D |
The decay constant λ of the radioactive sample is the probability of decay of an atom in unit time, then
|
(a) λ decreases as atoms become older |
|
(b) λ increases as the age of atoms increases |
|
(c) λ is independent of the age |
|
(d) Behaviour of λ with time depends on the nature of the activity |
The angle of polarisation for any medium is 60o, what will be critical angle for this
|
(a) |
(b) |
(c) |
(d) |