Question

XII. What an atom of an element is called which have same atomic number but different mass
number?
D) None of the these
A) Isobars
C) Valency
B) Isotopes
XIN A cell is the structural and functional unit of life. Name the scientist, who discovered cell ?
A) Neydon B) Robert Hooks C) Alexander Fleming D) Carolus Linnaeus
XIV, Which organelle is known as the power house of the cell?
D) None of the these
C) Golgi Apparatus
A) Mitochondria
B) Plastids
XV. What is the ratio by number of atoms of hydrogen and oxygen in water?
D.) 1:4
C) 3:2
A.) 2:3
B.) 2:1
XVI. The rate of change of velocity is called :-
C) Acceleration
D) Displacemet
B) Momentum
A) Speed​

Answer 1

Answer:

1) Isotopes

2)-

3) mitochondria

4)2:1

5) Acceleration

Answer 2

Answer:

XII] B) Isotopes

XIII] B) Robert Hookes

XIV] A) Mitochondria

XV] A) 2:3

XVI] A) Speed