The human eye has a lens which has a
|
(a) Soft portion at its centre |
(b) Hard surface |
|
(c) Varying refractive index |
(d) Constant refractive index |
(c) Varying refractive index
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A wire of resistor R is bent into a circular ring of radius r. Equivalent resistance between two points X and Y on its circumference, when angle XOY is a, can be given by
|
(a) |
(b) |
(c) R (2 p – a) |
(d) |
The binding energies per nucleon for a deuteron and an α- particle are x1 and x2 respectively. What will be the energy Q released in the reaction 
|
(a) 4 |
(b) 4 |
(c) 2( |
(d) 2 |
Which of the following gates will have an output of 1
|
(a)
(a)
|
(b)
|
(c)
|
(d)
|
The figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet
|
(a) OQ should be large, OR should be small |
|
(b) OQ and OR should both be large |
|
(c) OQ should be small and OR should be large |
|
(d) OQ and OR should both be small |
The potential energy of a particle of mass m is given by
U(x) = 
l1 and l2 are the de-Broglie wavelengths of the particle, when 0 £ x £ 1 and x > 1 respectively. If the total energy of particle is 2E0, the ratio 
will be
|
(a) 2 |
(b) 1 |
(c) |
(d) |
A 60 watt bulb carries a current of 0.5 amp. The total charge passing through it in 1 hour is
|
(a) 3600 coulomb |
(b) 3000 coulomb |
(c) 2400 coulomb |
(d) 1800 coulomb |
Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is
|
(a) – 4 cm |
(b) 8 cm |
(c) 6 cm |
(d) 12 cm |
Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length + 20 cm when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is
|
(a) + 80 cm |
(b) – 80 cm |
(c) – 24 cm |
(d) –100 cm |
In the CB mode of a transistor, when the collector voltage is changed by 0.5 volt. The collector current changes by 0.05 mA. The output resistance will be
|
(a) 10 kW |
(b) 20 kW |
(c) 5 kW |
(d) 2.5 kW |
