SSC CGL Science – Scientific Discoveries, Inventions & Space Technology – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Scientific Discoveries, Inventions & Space Technology – Level 2 · Exam Level · Tier I Sprint – 18 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.  
Diagram-basedThe points P, Q, R and S on the timeline mark the years of four inventions/discoveries – telephone, X-rays, aeroplane and transistor (placed in proportion to the year). Which one is R?

Correct Answer: C [Aeroplane]

Explanation:

Telephone 1876 (P), X-rays 1895 (Q), aeroplane 1903 (R), transistor 1947 (S).

2.  
Diagram-basedIn the same timeline, the point S stands for the:

Correct Answer: D [Transistor]

Explanation:

Transistor, 1947 – far to the right.

3.  
Match the followingMatch the inventor with the invention:
P. James Watt Q. Alessandro Volta R. Theodore Maiman S. John Logie Baird
1. Laser 2. Improved steam engine 3. Television (first demonstration) 4. Electric battery

Correct Answer: A [P-2, Q-4, R-1, S-3]

Explanation:

Watt – steam engine; Volta – battery; Maiman – laser; Baird – television.

4.  
Match the followingMatch the ISRO mission with its launch vehicle (from isro.gov.in):
P. Chandrayaan-1 Q. Chandrayaan-3 R. Aditya-L1 S. NISAR
1. LVM3 M4 2. GSLV-F16 3. PSLV-C11 4. PSLV-C57

Correct Answer: D [P-3, Q-1, R-4, S-2]

Explanation:

Chandrayaan-1 – PSLV-C11; Chandrayaan-3 – LVM3 M4; Aditya-L1 – PSLV-C57; NISAR – GSLV-F16.

5.  
Chronological orderarrange in the order of their launch:
P. AstroSat
Q. Chandrayaan-1
R. Aditya-L1
S. Mars Orbiter Mission

Correct Answer: C [Q → S → P → R]

Explanation:

2008 (Q) → 2013 (S) → 2015 (P) → 2023 (R).

6.  
Assertion–ReasonAssertion (A): A geostationary satellite appears fixed in the sky.
Reason (R): It orbits above the equator with a period equal to one rotation of the Earth.

Correct Answer: A [Both A and R are true and R is the correct explanation of A]

Explanation:

Answer: Both A and R are true and R is the correct explanation of A. R explains A.

7.  
Assertion–ReasonAssertion (A): The kelvin is named after J. J. Thomson, who discovered the electron.
Reason (R): Several SI units are named after scientists.

Correct Answer: D [A is false but R is true]

Explanation:

Kelvin honours William Thomson (Lord Kelvin); A is false, R is true.

8.  
Odd one outOdd one out (discovery vs invention):

Correct Answer: B [Telephone]

Explanation:

Telephone is an invention; the others were discoveries.

9.  
The SI unit of frequency is named after:

Correct Answer: B [Heinrich Hertz]

Explanation:

Answer: Heinrich Hertz. hertz – frequency.

10.  
The landing site of Chandrayaan-3's Vikram lander has been named:

Correct Answer: C [Shiv Shakti point]

Explanation:

Shiv Shakti point (Statio Shiv Shakti); Tiranga point marks where Chandrayaan-2 touched the Moon.

11.  
AstroSat, launched on 28 September 2015, is described by ISRO as:

Correct Answer: D [India's first dedicated space astronomy observatory]

Explanation:

From the AstroSat page on isro.gov.in.

12.  
Who received the Nobel Prize for the explanation of the photoelectric effect?

Correct Answer: A [Albert Einstein]

Explanation:

Answer: Albert Einstein. Nobel 1921.

13.  
The atomic nucleus was discovered through the gold-foil experiment by:

Correct Answer: D [Ernest Rutherford]

Explanation:

Answer: Ernest Rutherford. 1911.

14.  
Statement-basedWhich pair is NOT correctly matched?

Correct Answer: C [S. Chandrasekhar – Raman effect]

Explanation:

Raman effect – C. V. Raman; Chandrasekhar – limit for white dwarf stars.

15.  
Remote-sensing satellites are usually placed in:

Correct Answer: B [Polar / Sun-synchronous orbits]

Explanation:

Polar orbits let them see the whole Earth.

16.  
The Mars Orbiter Mission was inserted into orbit around Mars on (as per isro.gov.in):

Correct Answer: A [24 September 2014]

Explanation:

Launched 5 Nov 2013 by PSLV-C25; Mars orbit 24 Sept 2014 – at the first attempt.

17.  
Antiseptic surgery using carbolic acid was introduced by:

Correct Answer: C [Joseph Lister]

Explanation:

Laennec – stethoscope; Einthoven – ECG; Harvey – blood circulation.

18.  
The SpaDeX mission of ISRO demonstrated:

Correct Answer: B [docking of two spacecraft in orbit]

Explanation:

SDX-01 and SDX-02 docked on 16 January 2025.

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