Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
Consider the following statements about a solenoid :
1) The magnetic field strength in a solenoid depends upon the number of turns per unit length in the solenoid
2) The magnetic field strength in a solenoid depends upon the current flowing in the wire of the solenoid
3) The magnetic field strength in a solenoid upon the diameter of the solenoid
Which of the statements given above are correct?
1, 2 and 3
1 and 3 only
2 and 3 only
1 and 2 only
Light year is a unit of measurement of
very large distances
time interval in years
amount of light received on earth in a year
mass of atoms
The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eye-piece is
12.5 cm
5 cm
2 cm
10 cm
Which one of the following forces is non-central and non-conservative?
Frictional force
Electric force
Gravitational force
Mechanical force
On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compounds?
Copper carbonate
Copper oxide
Copper sulphate
Copper Nitrate
