One solar mass is equal to :

1. 3 x 10²⁰ kg
2. 2 x 10²⁷ kg
3. 2 x 10³⁰ kg
4. 3 x 10³⁰ kg

One lunar cycle is nearly equal to:

1. 28.5 days
2. 29.5 days
3. 30 days
4. 30.5 days

Which of the following unit is equivalent to watt?

1. Volt x Ampere
2. Volt/Ampere
3. Ampere/Volt
4. Ohm

Which one of the following is a derived unit?

1. Metre
2. Kelvin
3. Metre³
4. Mole