1. ● Power is the rate of doing work, the amount of energy transferred per unit time. 
2. ● The SI unit of power is Watt (W).

The SI unit for pressure is the pascal (Pa), equal to one newton per square meter (N/m² ).

Hence, the correct option (d).

The colours of stars depend on their temperature.

Stars come in lots of different colours, and their colour depends on the temperature of the star. We find that small stars are cool (less than 3000°C) with a red-ish appearance, whereas big heavy stars are hot (over 30,000°C), and have a blue-ish glow.

The middle vein of a compound leaf or a frond, when it is present, is called a rachis. Leaves are twice divided: the leaflets are arranged along a secondary vein that is one of several branching off the rachis. Each leaflet is called a pinnule.

1.  Electropositive Atoms having a positive electric charge (of an atom, group, molecule etc.) tending to release electrons and form positive ions or polarized bonds compare to electronegative.
2.  Electropositive elements tend to lose electrons and form positive ions (e.g. the univalent alkali metals Li⁺,Na⁺,K⁺ etc., and the divalent alkaline-earth metals).

Iltutmish was the first Sultan of Delhi to issue regular currency and declare Delhi as the capital of his empire before it Badayun (1210–1214) was the capital.

Jammu and Kashmir. Gulmarg ("Meadow of Flowers") is a town, a hill station, a popular skiing destination and a notified area committee in Baramula district in the Indian state of Jammu and Kashmir. The town is sitiuated in the Pir Pinjal range in the western the Himalayas and is within miles of the Line of Control between India and Pakistan.

Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction is not true about Frictional force. Frictional force is a contact force that acts in the opposite direction to the motion of an object. This force can cause objects in motion to come to rest, as they act in the opposite direction to its motion.

When traveling to an altitude much higher than usual RBCs are kicked into circulation early, in a less mature and hence less competent, form by the Reticuloendothelial System (RES) in response to a sudden demand for more oxygen than had been usual at the lower elevation.

The atoms of the elements having same difference between mass number and atomic number are called Isotones. Two nuclides are isotones if they have the same number of neutrons, but different number of protons.

Hence, the correct option is (C).