Physics-
General
Easy
Question
A bird weighs 2 kg and is inside a closed cage of 1 kg. If it starts flying, then what is the weight of the bird and cage assembly :
- 1.5 kg
- 2.5 kg
- 3 kg
- 4 kg
The correct answer is: 3 kg
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Physics-
Assertion : The coil is bound over the metallic frame in moving coil galvanometer.
Reason : The metallic frame help in making steady deflection without any oscillation.
Assertion : The coil is bound over the metallic frame in moving coil galvanometer.
Reason : The metallic frame help in making steady deflection without any oscillation.
Physics-General
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Assertion : Free electron always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it.
Reason : The average velocity of free electron is zero.
Assertion : Free electron always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it.
Reason : The average velocity of free electron is zero.
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If m is magnetic moment and B is the magnetic field, then the torque is given by.
If m is magnetic moment and B is the magnetic field, then the torque is given by.
Physics-General
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Three long, straight and parallel wires carrying currents are arranged as shown in the figure. The wire C which carries a current of 5.0 amp is so placed that it experiences no force. The distance of wire C from wire D is then
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Physics-General
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Two thin long parallel wires separated by a distance b are carrying a current i amp each. The magnitude of the force per unit length exerted by one wire on the other is
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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
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Physics-General
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Two free parallel wires carrying currents in opposite direction
Two free parallel wires carrying currents in opposite direction
Physics-General
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A very long straight wire carries a current I. At the instant when a charge +Q at point P has velocity 
, as shown, the force on the charge is
A very long straight wire carries a current I. At the instant when a charge +Q at point P has velocity , as shown, the force on the charge is
Physics-General
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A proton moving with a velocity, 2.5×107m/s, enters a magnetic field of intensity 2.5T making an angle 30° with the magnetic field. The force on the proton is
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Physics-General
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A moving charge will gain energy due to the application of.
A moving charge will gain energy due to the application of.
Physics-General
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Assume that the nuclear binding energy per nucleon (B/A) versus mass number (A) is as shown in the figure. Use this plot to choose the correct choice(s) given below. Figure :
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Physics-General
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The above is a plot of binding energy per nucleon Eb , agains the nuclear mass M; A, B, C, D, E, correspond to different nuclei. Consider four reactions :
(i) 
(ii) 
(iii) 
and (iv) 
where 
is the energy released? In which reactions is positive?
The above is a plot of binding energy per nucleon Eb , agains the nuclear mass M; A, B, C, D, E, correspond to different nuclei. Consider four reactions :
(i) (ii)
(iii) and (iv)
where is the energy released? In which reactions is positive?
Physics-General
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60 W, 100 W and 1000 W bulbs are connected in parallel to the mains. The bulb that will be brightest is (all of them have same specified voltage)
60 W, 100 W and 1000 W bulbs are connected in parallel to the mains. The bulb that will be brightest is (all of them have same specified voltage)
Physics-General
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The emf of a cell is 2 V and its internal resistance is 2 ohm. A resistance of 8 ohm is joined to battery in parallel. This is contacted in secondary circuit of potentiometer. If 1V standard cell balances for 100 cm of potentiometer wire, the balance point of above cell is
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Physics-General
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A potentiometer wire of 10 m length and 20Ohm resistance is connected in series with a resistance R Ohms and a battery of emf 2 V, negligible internal resistance. Potential gradient on the wire is 0.16 millivolt / centimeter then R is-ohms.
A potentiometer wire of 10 m length and 20Ohm resistance is connected in series with a resistance R Ohms and a battery of emf 2 V, negligible internal resistance. Potential gradient on the wire is 0.16 millivolt / centimeter then R is-ohms.
Physics-General
