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 2 m, 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 room heater contains three insulated copper wires of three different colours - Red, Green and Black. Which one of the following is the correct code?

The graph between current (I) and voltage (V) for three linear resistor 1, 2 and 3 is given below :

Image

If R₁, R₂ and R₃ are the resistances of these resistors, then which one of the following is correct?

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.

4. The magnification of a microscope increases with the increase in focal length of its objective.

Which of the statement(s) given above are correct?