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Through which character we can distinguish the light waves from sound waves
|
(a) Interference |
(b) Refraction |
(c) Polarisation |
(d) Reflection |
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 |
Three charges Q, +q and +q are placed at the vertices of a right-angled isosceles triangle as shown. The net electrostatic energy of the configuration is zero if Q is equal to
|
(a) |
(b) |
(c) -2q |
(d) +q |
The drift velocity does not depend upon
|
(a) Cross-section of the wire |
(b) Length of the wire |
|
(c) Number of free electrons |
(d) Magnitude of the current |
A galvanometer of resistance 20 W is to be converted into an ammeter of range 1 A. If a current of 1 mA produces full scale deflection, the shunt required for the purpose is
|
(a) 0.01 W |
(b) 0.05 W |
(c) 0.02 W |
(d) 0.04 W |
Resistors of 1, 2, 3 ohm are connected in the form of a triangle. If a 1.5 volt cell of negligible internal resistance is connected across 3 ohm resistor, the current flowing through this resistance will be
|
(a) 0.25 amp |
(b) 0.5 amp |
(c) 1.0 amp |
(d) 1.5 amp |
When a proton is accelerated through 1V, then its kinetic energy will be
|
(a) 1840 eV |
(b) 13.6 eV |
(c) 1 eV |
(d) 0.54 eV |
$\sqrt{\frac{\text{GM}}{4\text{R}}}$
$\sqrt{\frac{\text{RM}}{2\text{R}}}$
$\sqrt{\frac{\text{GM}}{\text{R}}}$
$\sqrt{\frac{2\text{GM}}{\text{R}}}$
