Physics
Why the needle of iron swims on water surface when it is kept gently ?

Due to its shape
Due to surface tension
It will remain under the water, when it will displace more water than its weight
The density of needle is less than that of water

ANSWER DOWNLOAD EXAMIANS APP

Physics
In total internal reflection, the light travel from

Denser to rarer medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with no loss of intensity
Denser to rarer medium and it occurs with loss of intensity
Rarer to denser medium and it occurs with loss of intensity

ANSWER DOWNLOAD EXAMIANS APP