In a room containing air, heat can go from one place to another (a) by conduction only

(c) disturbance moves

Correct Answer is: (d)  Sound is transmitted by particles (atoms or molecules) in a solid, liquid or gas colliding with each other. It is a wave which is created by vibrating...

We can see any object, when light reflected by that object reaches our eyes. But in the dark room, no light is reflected by the object so we are unable...

Since each light can be switched on independently, there are two options for each bulb (on or off) ∴Total no. of ways the bulbs can be operated= 210 This includes all the bulbs are...

Let us denote 2 boys and 2 girls in room X as B1, B2 and G1, G2 respectively. Let us denote 1 boy and 3 girls in room Y as...

(a) positive ions (b) negative ions (c) electrons

(c) both electrons and holes

The Right option is  (d) 90° W,

(d) earth → sky  water → light  light → air  air →  water  sky → earth If someone is thirsty, then he would drink water. Now, water on that planet means light, so he would drink light.