Write any one example of acidic salt?

7. One use of artificial satellite is for communication (e.g., satellite TV and radio broadcasting).

8. One full form of ATM is Automated Teller Machine.

10. Two precautions while using ATM:

1. Always cover the keypad while entering PIN to prevent shoulder surfing.
2. Check the ATM for any tampering or skimming devices before use.

11. Molecular weight of $CaSO_4$.

Atomic masses: $Ca = 40\, u$, $S = 32\, u$, $O = 16\, u$.

Formula: $CaSO_4 = Ca + S + 4 \times O$.

Substitute: $40 + 32 + 4 \times 16$.

Calculate: $4 \times 16 = 64$.

$40 + 32 = 72$.

$72 + 64 = 136$.

Molecular weight $= 136\, u$.

$\boxed{136\ u}$

12. Relative velocity of bus with respect to car.

Given: Velocity of bus $v_b = 25\, \mathrm{m/s}$ east, velocity of car $v_c = 15\, \mathrm{m/s}$ east (same direction).

Formula: Relative velocity $v_{b/c} = v_b - v_c$ (since same direction).

Substitute: $25\, m/s - 15\, \mathrm{m/s}$.

Simplify: $10\, \mathrm{m/s}$ (east).

$\boxed{10\ m/s\ (east)}$

14. Two hypotheses on origin of life:

1. Chemical evolution theory: Life originated from non-living matter through chemical reactions in primordial soup (Oparin-Haldane theory).
2. Panspermia hypothesis: Life came to Earth from outer space via meteorites or comets carrying microorganisms.

15. Biodiversity is the variety and variability of life on Earth, including diversity within species, between species, and ecosystems.

Its types:

1. Genetic diversity (variation in genes within a species).
2. Species diversity (variety of species in an area).
3. Ecosystem diversity (variety of ecosystems in a region).

16. Neat and labelled diagram of bacterial cell:

(Description for diagram: Draw an oval shape for cell. Label: Cell wall (outer rigid layer), Plasma membrane (inner layer), Cytoplasm (jelly-like inside), Nucleoid (DNA region, not nucleus), Ribosomes (dots), Flagellum (tail for movement), Pili (hair-like for attachment).)

Simple labelled sketch in text form:

  Flagellum
     |
[Cell wall] -- Pili
  | Plasma membrane |
  |   Nucleoid (DNA) |
  | Cytoplasm + Ribosomes |