The path followed by a projectile is called its?
The total flight requires a time that is?
Two resistance r1 and r2 (r1 < r2 ) are connected in parallel. Their equivalent resistance R is
The distance from the center of earth to the center of the moon’ is called as?
If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this ?
A current of 5A is flowing at 220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200 V and 50% of power is lost, then the current in the secondary will be
Conductance is the reciprocal of?
A count rate meter shows a count of 240 per minute from a given radioactive source. One hour later the meter shows a count rate of 30 per minute. The half-life of the source is _______.
A horizontal metal wire is carrying an electric current from the north to the south. Using a uniform magnetic field, it is to be prevented from falling under gravity. The direction of this magnetic field should be towards the______.
If a rock is brought from the surface of the moon to the earth, then
The temperature of an open room volume 30 m3 increases from 17°C to 27°C due to sunshine. The atmospheric pressure in the room remains 1 × 105 Pa. If ni and nf are the number of molecules in the room before and after heating, then nf – ni will be :-
Solar eclipse will take place when
Metal resistors that conduct in accordance with Ohm’s law are said to be?
Kilowatt-hour (KWH) is the unit of?
A circuit contains two un-equal resistances in parallel
Two identical solid copper spheres of radius R placed in contact with each other. The gravitational attracton between them is proportional to
A : At high altitude regions the cooking of food becomes difficult.
B : Water boils at lower temperature when the pressure is low.
What would be the duration of the year if the distance between the earth and the sun gets doubled?
Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is
A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75°C. T is given by : (Given : room temperature = 30° C, specific heat of copper = 0.1 cal/gm°C
Superposition theorem is not applicable for
Consider the following statements:
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statement(s) given above is/are correct?
Electromotive force may be defined as the?
How many 6mF, 200 V condensers are needed to make a condenser of 18 pF, 600 V?
The absorption of ink by blotting paper involves
If the acceleration due to gravity of a planet is half the acceleration due to gravity of earth’s surface and radius of planet is half the radius of the earth, the mass of planet in terms of mass of earth is
In the above circuit the current in each resistance is :
2V 2V 2V
1 1 1
2V 2V 2V
Consider the following statements and select the correct code.
Assertion (A) : Small glass beads fixed on traffic signals glow brightly when light falls upon them. Reason (R) : Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium.