A thin prism P1 of angle 4 ° and refractive index 1.54 ° is combined with another thin prism P2 of refractive index 1.72 to produce dispersion without deviation. The angle of P2 is
What will be the number of photons emitted per second by a 10 W sodium vapour lamp assuming that 90% of the consumed energy is converted into light [Wavelength of sodium light is 590 nm, and h = 6.63×10-34 J –s]
As shown in the figure a magnet is moved with a fast speed towards a coil at rest. Due to this induced emf, induced current and induced charge in the coil is E, I and Q respectively. If the speed of the magnet is doubled, the incorrect statement is-
1. E increases 2. I increases 3. Q remains same 4. Q decreases
Subtopic: Faraday's Law & Lenz Law |
Other Reason
Add Note
Please attempt this question first.
Hints
Don't halt your daily learning journey !!!
Go Premium and unlock limitless education potential beyond daily practice limits!
Two tangent galvanometer having coils of the same radius are connected in series. A current flowing in them produces deflection of 60 ° and 45 ° respectively. The ratio of the number of turns in the coils is
A bar magnet of magnetic moment 104 J/T is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of 4×10-5 T to a direction of 60 ° from the field will be
An ideal coil of 10 H is joined in serried with a resistance of 5 Ω and battery of 5 V, 2 s after joining the current flowing (in ampere) in the circuit will be
A rocket is fired upward from the earth surface such that it creates an acceleration of 19.6 m/s2. If after 5 s, its engine is switched off, the maximum height of the rocket from earth’s surface would be
1. 245 m 2. 490 m 3. 980 m 4. 735 m
Subtopic: Distance & Displacement |
Other Reason
Add Note
Please attempt this question first.
Hints
Don't halt your daily learning journey !!!
Go Premium and unlock limitless education potential beyond daily practice limits!
A 60 kg weight s dragged on a horizontal surface by a rope through a distance of 2m. If coefficient of friction is μ=0.5, the angle of rope with surface is 60 ° and g =9.8 m/s2, then work done is
1. 294 J 2. 15 J 3. 588 J 4. 197 J
Subtopic: Friction |
Other Reason
Add Note
Please attempt this question first.
Hints
Don't halt your daily learning journey !!!
Go Premium and unlock limitless education potential beyond daily practice limits!