1.
The gravitational force between two objects decreases by 36%, when the distance between them is increased by 4m. Find the original distance between them.
2.
A body at 50∘C50∘C cools in a surroundings maintained at 30∘C30∘C. Calculate the temperature of the body at which the rate of cooling is half that of the beginning in same surrounding.
3.
A tuning fork vibrating with a sonometer wire of length 20cm produces 5 beats per second. The beat frequency does not change if the length of the wire is changed to 21cm. The frequency of the tuning fork must be
4.
A wave is represented by an equation : Y=AcoskxsinωtY=Acoskxsinωt, then
5.
Plane polarized light is passed through a polaroid. Now the polaroid is given one complete rotation about the direction of light propagation. When viewed through the polaroid, one of the following is observed.
6.
The plates of a charged capacitor are connected by a conducting wire. The quantity of heat produced in the wire is
7.
A metre bridge is balanced with known resistance in the right gap and a metal wire in the left gap. If the metal wire is heated the balance point.
8.
A charged particle is fired perpendicular to a uniform magnetic field. The field
9.
In the proton-carbon cycle of nuclear fusion carbon acts like a
10.
All are true about mammary gland, except ?
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