B. Write True or False. (7x1=7 mks) Q1. A force can change the shape and size of a body.
Q2. Muscular force applied as push and pull is called as a contact force.
Q3. Gravitational force is always attractive.
Q4. Friction is the force that opposes the relative motion.
Q5. Friction causes wear and tear.
Q6. The frictional force is more between smooth surface.
Q7. Rolling friction is much more than sliding friction.

some think that theories become laws, but theories and laws have separate and distinct roles in the scientific method. a law is a description of an observed phenomenon in the natural world that hold true every time it is tested. it doesn't explain why something is true; it just states that it is true.

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radiation

explanation:

heat is transmitted by radiation

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia