21 Which planet of the Solar System has the shortest year?

Mercury

22 Will the sun of our Solar System ever cool down?

Yes, in the billions of years from now

23 Gypsum is a

Non-metallic mineral

24 A good quantity of Gypsum is used in the manufacturing of

Fertilizers

25 Samuel Hahnemann was the father of

Homeopathy

26 The colour of light that travel with minimum speed through glass is

Violet

27 The amplification factor of a triode depends upon

Plate resistance

28 The humerus and scapula form

Ball and Socket joint

29 Euglena reproduces by

Binary fission

30 A thermos bottle keeps a liquid hot because

Heat losses by convection and radiation are largely prevented