PHYSICS

 Ans: Step down transformer. Secondary coil is made with thicker wire than primary coil wire. It means that more current is flowing through secondary coil. It indicates that secondary emf is lower than primary emf. Hence stepdown transformer 

Step up transformer increases the magnitude of alternating e.m.f.  As the power remains same , current should decrease as per the formula, power= emf x current. So the statement is TRUE.

Magnification is -5:  The negative magnification means the image is real and the absolute value(without negative sign) of magnification (5) indicates that the image is real and inverted.

In uniform circular motion,  1. Speed is constant. 2. Velocity is variable and acts along tangential direction  at a point. 3. Centripetal Force and acceleration act along the radius towards the centre if the circular path.  4. Centrifugal force appears to  act radially outwards. It is a virtual  ,fictitious force, not a real force.

Heat capacity depends on mass. More the mass of a substance, more is the heat capacity. That's why the cooking vessels have thick bases to absorb more heat and to tranfer more heat to the food for longer period of time.

 Any two masses in the universe attract each other with a force which is  i) directly proportional to the product of the masses, ii) inversely proportional to the square of the distance between their centres. F=GmM/r²  where G= universal gravitational constant. m and M are the masses of two bodies. r = distance between them.  * Larger the masses , greater is the force between them. * Larger the distance , smaller is the force. * If the distance is halved , force increases 4 times. * If the distance is doubled,  force becomes one-fourth. * The force is not effected with any medium between the masses.