The current in the coil of inductance 5H decreases at the rate of 2 A/s
The current in the coil of inductance 5H decreases at the rate of 2 A/s. The induced e.m.f is
Options
(a) 2 V (b) 5 V (c) 10 V (d) -10 V
Correct […]
Physics
The ratio of the numerical value of the average velocity and average speed
The ratio of the numerical value of the average velocity and average speed of a body is always
Options
(a) Unity (b) Unity or less (c) Unity or more (d) Less than unity
If a magnetic substance is kept in a magnetic field, then which of the following
If a magnetic substance is kept in a magnetic field, then which of the following is thrown out
Options
(a) paramagnetic (b) ferromagnetic (c) diamagnetic (d) antiferromagnetic
Correct Answer:
diamagnetic
Explanation:
No explanation […]
A thin wire of resistance 4 ohm is bent to form a circle. The resistance across
A thin wire of resistance 4 ohm is bent to form a circle. The resistance across any diameter is
Options
(a) 4 ohm (b) 2 ohm (c) 1 ohm (d) 8 ohm
Correct […]
The minimum wavelength of X-rays emitted by X-ray tube is 0.4125Å
The minimum wavelength of X-rays emitted by X-ray tube is 0.4125 Å. The accelerating voltage is
Options
(a) 30 kV (b) 50 kV (c) 80 kV (d) 60 kV
Correct Answer:
30 kV
Two sound waves of wavelengths 5m and 6m formed 30 beats in 3 seconds
Two sound waves of wavelengths 5m and 6m formed 30 beats in 3 seconds. The velocity of sound is
Options
(a) 300 m/s (b) 310 m/s (c) 320 m/s (d) 330 m/s
Correct […]
Electric potential at any point is V= -5x +3y + √(15) z. Then the magnitude of electric
Electric potential at any point is V= -5x +3y + √(15) z. Then the magnitude of electric field is
Options
(a) 3 √2 (b) 4 √2 (c) 5 √2 (d) 7
Correct Answer: […]
If force is proportional to square of velocity, then the dimension of proportionality
If force is proportional to square of velocity, then the dimension of proportionality constant is
Options
(a) MLT⁰ (b) MLT⁻¹ (c) ML⁻²T (d) ML⁻¹T⁰
Correct Answer:
ML⁻¹T⁰
Explanation:
No explanation available. Be the […]
Two liquid drops having diameters of 1 cm and 1.5 cm. The ratio of excess
Two liquid drops having diameters of 1 cm and 1.5 cm. The ratio of excess pressure inside them is
Options
(a) 1 : 1 (b) 5 : 3 (c) 2 : 3 (d) […]
A charge of 40 µC is given to a capacitor having capacitance C=10 µF
A charge of 40 µC is given to a capacitor having capacitance C=10 µF. The stored energy in erg is
Options
(a) 80 x 10⁻⁶ (b) 800 (c) 80 (d) 8000
Correct Answer: […]