Light from the sun reaches upon in nearly
1). 8 min.
2). 2 min.
3). ?6 min.
4). 4 min.
Rainbow is formed due to
1). refraction and dispersin?
2). scattering and refraction?
3). diffreaction and refraction
4). refraction and reflection
?The colours of starts depends on?their
1). temperature?
2). distance
3). radius?
4). atmospheric pressure
?Radar is used to
1). locate submerged submarines?
2). receive signal from radio receivers?
3). detect and locate distant objects
4). ?locate geostationary satellites?
The head mirror used by E.N.T.?doctors is
1). Cancave
2). ?convesx
3). ?plane
4). planoconvex