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
We are given three copper wires of different lengths and different areas of cross-section. Which one of the following would have highest resistivity?
Copper wire of 50 cm length and 1 mm diameter
Copper wire of 23 cm length and 0.5 mm diameter
Copper wire of 10 cm length and 2.0 mm diameter
All the wires would have same resistivity
Which one of the following is an electric conductor?
A plastic sheet
Distilled water
Human body
A wooden thin sheet
A non-spherical shining spoon can generally be considered as a
Spherical mirror
Parabolic mirror
Plane mirror
Lens
Who amongst the following is pioneer in discovering the heating effect of electric current?
Isaac Newton
Galileo Galilei
James P. Joule
J.J. Thomson
Which one of the following laws of electromagnetism does not give the direction of magnetic field?
Right hand thumb rule
Fleming’s left-hand rule
Fleming’s right-hand rule
Faraday’s law of electromagnetic induction
