Q. The best conductor of electricity among the following is :
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Q. The unit of energy in MKS system is
Q. The least penetrating power ray is
Q. Which of the following devices converts electrical energy into mechanical energy?
Q. An ordinary clock loses time in summer. This is because
Q. Light waves are different from sound waves
Q. For an object, the state of rest is considered to be the state of ________ speed.
Q. What do we call the nuclides having same mass number?
Q. As water is cooled from 4 deg C to 0 deg C, its density
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