SSC 10th Science Part 1 (Maharashtra Board): Important MCQs
Question 1: Gravitation
The value of universal gravitational constant ($G$) in SI unit is ____________.
- A) $6.673 \times 10^{-11} \text{ N m}^2/\text{kg}^2$ ✓ Correct
- B) $6.673 \times 10^{-11} \text{ kg}^2/\text{N m}^2$
- C) $9.8 \times 10^{-11} \text{ N m}^2/\text{kg}^2$
- D) $9.8 \text{ m/s}^2$
Explanation: The accepted value of the universal gravitational constant ($G$) is $6.673 \times 10^{-11} \text{ N m}^2/\text{kg}^2$.
Question 2: Periodic Classification of Elements
Halogens belong to group ____________ in the modern periodic table.
- A) 15
- B) 16
- C) 17 ✓ Correct
- D) 18
Explanation: Group 17 elements (Fluorine, Chlorine, Bromine, Iodine, Astatine) are collectively known as Halogens.
Question 3: Chemical Reactions and Equations
The reaction of an iron nail with a copper sulphate solution is an example of a ____________ reaction.
- A) Combination
- B) Decomposition
- C) Displacement ✓ Correct
- D) Double displacement
Explanation: Iron is more reactive than copper, so it displaces copper from the copper sulphate solution ($Fe + CuSO_4 \rightarrow FeSO_4 + Cu$).
Question 4: Effects of Electric Current
The device used for producing electric current is called a ____________.
- A) Voltmeter
- B) Ammeter
- C) Galvanometer
- D) Generator ✓ Correct
Explanation: An electric generator converts mechanical energy into electrical energy based on electromagnetic induction.
Question 5: Refraction of Light
The velocity of light is maximum in ____________.
- A) Glass
- B) Water
- C) Vacuum ✓ Correct
- D) Diamond
Explanation: The speed of light is highest in a vacuum ($3 \times 10^8 \text{ m/s}$) because there are no particles to impede its path. The refractive index of vacuum is exactly 1.
