Physics
A white and smooth surface is

Bad absorber and good reflector of heat
Good absorber and good reflector of heat
Good absorber and bad reflector of heat
Bad absorber and bad reflector of heat

ANSWER DOWNLOAD EXAMIANS APP

Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Burst after reaching some height
Continue going upwards uninterrupted
Reach a particular height and start coming down

ANSWER DOWNLOAD EXAMIANS APP