When a glass rod is rubbed with silk, then which type of charge is created on it?
Positive charge
Negative charge
Electric charge
None of these
On a moving plane mirror, incident ray forms an angle of 60°, then what will be the reflected angle?
60°
90°
30°
120°
Which one of the following is a renewable resource of energy?
Petroleum
Groundwater
Natural gas
Coal
Which physical unit is obtained by the ratio of momentum and velocity of matter?
Acceleration
Mass
Velocity
Force
Brine' is
Common name of bleaching powder
aqueous solution of chlorine
saturated solution of NaCl
aqueous solution of Na2SO4
A battery of 15 V is connected to a parallel group of resistance of 4, 10 and 20 . The current in the circuit will be
6 A
4 A
8 A
2 A
One nanometer is equal to
10-7cm
10-8cm
10-6m
10-9m
D.
10-9m