The absolute zero temperature is o kelvin. In C unit, which one of the following is the absolute zero temperature?

Consider the following statements about visible light, UV light and x-rays : 

1) The wavelength of visible light is more than that of X-rays

2) The energy of X-rays photons is higher than that of UV light photons.

3) The energy of UV light photons is less than that of visible light photons.

Which of the statements given above is/are correct?

The time period of oscillation of a simple pendulum having length L and mass of the bob m is given as T. If the length of the pendulum is increased to 4L and the mass of the bob is increased to 2m, then which one of the following is the new time period of oscillation?

The connecting cable of electrical appliances like electric iron, water heater or contains three insulated copper wires of three different colours- red, green and black. Which one of the following is the correct colour code?

Consider the following statements about a microscope and a telescope: 

1) Both the eyepiece and the objective of a microscope are convex lenses.

2) The focal length of the objective of a telescope is larger than the focal length of its eyepiece

3) The magnification of a telescope increases with the increase in focal length of its objective.

Which of the statements given above are correct?