A stable nucleus (light with A < 10) has
Kilowatt-hour is the unit of
Which one among the following is used to make periscope?
Potential at a point due to a point charge is V. The charge is doubled and also the distance of the point from the charge is doubled. The new potential is
A neutral (uncharged) metal ball is suspended using a non-magnetic string. A positively charged insulating rod is placed near the ball which is observed to be attracted to the rod. This is because
Which one among the following is the correct value of the gravitational force of the Earth acting on a body of mass 1 kg?
A body is thrown upward against the gravity ‘g’ with initial velocity ‘u’. Which one among the following is the correct expression for its final velocity when the body attains the maximum height?
The final velocity for a body thrown upwards is always 0. However, the maximum height attained by the body can be given by the expression u2/2g derived from the formula v2 - u2 = 2gs, where u is the initial velocity, v is the final velocity and s is the height attained
If the ratio of the weight of a man in a stationary lift and when it is moving downwards with uniform acceleration ‘a’ is 3 : 2, then the value of ‘a’ is
The current produced by upwelling of cold water off the coast of Chile and Peru is known as
A one-rupee coin is placed at the bottom of a vessel. Water is then poured into the vessel such that the depth of water becomes 20 cm. If water has refractive index 4/3, the coin would be seen at a depth of
The spread in colours in a rainbow on sky is primarily due to
Gravitational force shares a common feature with electromagnetic force. In both cases, the force is
A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I i.e. VI may be understood as
An optician prescribes a power = - 0.5 dioptre. The corresponding lens must be a
If an object undergoes a uniform circular motion, then its ?
The motion of a particle is given by a straight line in the graph given above drawn with displacement (x) and time (t). Which one among the following statements is correct?
An object moving is undergoing a non accelerated motion. Its rate of change in momentum is
A motor vehicle is moving on a circle with uniform speed. The net acceleration of the vehicle is
The displacement of a particle is given by x = cos2ωt. The motion is
Which one among the following situations is best represented by the velocity – time plot shown above?
White light while passing through a glass prism breaks up into light of different colours because
Bats can know about their prey at a distance even in the night by emitting
The ceilings of a concert hall are generally curved
An electric heater is rated 1500 watt. If electric power costs Rs 2 per kilo-watt-hour, then the cost of power for 10 hours running of the heater is
Suppose we have an iron nail and an iron ball of same mass. When submerged in water, the iron ball may float but the nail always sinks. This is because
No correct answer. A steel pin may float due to surface tension, if placed carefully on water. However an iron ball in all likelihood will sink.
The plot given above represents the velocity of a particle (in m/s) with time (in seconds). Assuming that the plot represents a semi-circle distance traversed by the particle at the end of 7 seconds is approximately
Area under a velocity-time graph indicates the displacement
What should be the reading of the voltmeter in the circuit given above? (All the resistances are are equal to 1 Ω and the battery is of 1.5 volt)
A bullet of mass 20 gm is fired in the horizontal direction with a velocity 150 m from a pistol of mass 1 kg. Recoil velocity of the pistol is
The plot given above represents displacement ‘x’ of a particle with time ‘t’. The particle is
Motion, of a particle can be described in x-direction by x = a sin ωt, and y-direction by y = b cos ωt. The particle is moving on