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
Which one of the following statements about glass is not correct?
Glass is often said to be a supercooled liquid.
Glass has no definite melting point.
Soda glass is harder than pyrex glass.
Boron is present in pyrex glass
When does a ball bounce off the ground, which of the following changes suddenly? (Assume no loss of energy to the floor)
Its speed
Its momentum
Its kinetic energy
Its potential energy
Which one of the following statements regarding Ohm's law is not correct?
Ohm's law is an assumption that current through a conductor is always directly proportional to the potential difference applied to it.
A conducting device obeys Ohm's law when the resistance of a device is independent of magnitude and polarity of applied potential difference.
A conducting material obeys Ohm's law when the resistance of a material is independent of the magnitude and direction of the applied electric field.
All homogeneous materials obey Ohm's law irrespective of whether the field is within range or strong.
In which of the following phenomena do heatwaves travel along a straight line with the speed of light?
Thermal conduction
Thermal convection
Thermal radiation
Both thermal conduction and radiation
A thin disc and a thin ring, both have mass M and radius R. Both rotate about axes through their centre of mass and are perpendicular to their surfaces at the same angular velocity. Which of the following is correct?
The ring has higher kinetic energy
The disc has higher kinetic energy
The ring and the disc have the same kinetic energy
Kinetic energies of both the bodies are zero since they are not in linear motion
