SSC CGL Science – Matter & Atomic Structure – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Matter & Atomic Structure – Level 1 · Warm-up · Tier I Level – 12 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
The state of matter found in the Sun and other stars is:

Correct Answer: C [plasma]

Explanation:

Stars are made of plasma (hot, ionised gas); their energy comes from nuclear fusion.

2.  
The Bose–Einstein condensate is named partly after the Indian scientist:

Correct Answer: A [Satyendra Nath Bose]

Explanation:

S. N. Bose's statistics (with Einstein's work) predicted the condensate.

3.  
Which of these substances sublimes on heating?

Correct Answer: B [Camphor]

Explanation:

I CAN Dry: iodine, camphor, ammonium chloride, naphthalene, dry ice.

4.  
A temperature of 27 °C on the Kelvin scale is:

Correct Answer: D [300 K]

Explanation:

Answer: 300 K. K = 27 + 273 = 300.

5.  
The neutron was discovered by:

Correct Answer: D [James Chadwick]

Explanation:

Chadwick, 1932; Thomson – electron; Rutherford – nucleus; Goldstein – canal rays.

6.  
The number of neutrons in ²³₁₁Na is:

Correct Answer: C [12]

Explanation:

Answer: 12. n = A − Z = 23 − 11 = 12.

7.  
The maximum number of electrons that the M shell (n = 3) can hold is:

Correct Answer: A [18]

Explanation:

Answer: 18. 2n² = 2 × 9 = 18.

8.  
Which of these will show the Tyndall effect?

Correct Answer: B [Milk]

Explanation:

Milk is a colloid (emulsion) and scatters light; true solutions do not.

9.  
Cream is separated from milk by:

Correct Answer: D [centrifugation]

Explanation:

Fast spinning separates the lighter cream from the rest of the milk.

10.  
Which of the following is a chemical change?

Correct Answer: C [Rusting of iron]

Explanation:

Rusting forms a new substance (hydrated iron oxide).

11.  
Isotopes of an element have the same:

Correct Answer: A [atomic number]

Explanation:

Isotopes = same Z (protons), different A.

12.  
Diagram-basedThe atom shown (electrons drawn in their shells) is:

Correct Answer: B [Aluminium]

Explanation:

Shells 2, 8, 3 → 13 electrons → Z = 13 = aluminium.

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