What is the effective resistance (in Ω) of two resistors 21 Ω and 28 Ω connected in parallel?

 

Pressure is measured in terms of

If V/I is a constant, it is called:

Echoes may be heard more than once due to successive or multiple

Work done by an object on application of a force would be zero if the displacement of the object is:

Which of the following has the same unit as energy?

Consider a planet whose mass and radius are both twice the mass and radius of Earth. The acceleration due to gravity on the surface of the planet is 'n' times that on Earth. The value of n is:

A source maintains a current I in a resistor of resistor of resistance R. If V is the potential difference across the resistor. The electrical energy dissipated in the resistor in time is given _____

A particle experiences constant acceleration for 20 s after starting from rest. If it travels a distance X1, in the first 10 s and distance X2 in the remaining 10 s, then which of the following is true?