SSC CGL Science – Units, Measurement & Physical Quantities – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Units, Measurement & Physical Quantities – 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.  
One-line factThe SI unit of luminous intensity is:

Correct Answer: C [candela]

Explanation:

Candela (cd) is the SI base unit of luminous intensity; lumen is luminous flux, lux is illuminance.

2.  
Odd one outwhich of these is NOT an SI base quantity?

Correct Answer: B [Force]

Explanation:

Force is derived (kg m s⁻²); the other three are base quantities (A, mol, cd).

3.  
One light year is a unit of:

Correct Answer: D [distance]

Explanation:

Light year = distance travelled by light in vacuum in one year ≈ 9.46 × 10¹⁵ m.

4.  
The prefix 'nano' stands for:

Correct Answer: A [10⁻⁹]

Explanation:

nano = 10⁻⁹ (micro 10⁻⁶, pico 10⁻¹², giga 10⁹).

5.  
Which of the following is a vector quantity?

Correct Answer: B [Displacement]

Explanation:

Displacement has magnitude and direction; speed, mass and work are scalars.

6.  
A meter shows that a house used 5 units (kWh) of electricity. In joules this is:

Correct Answer: D [1.8 × 10⁷ J]

Explanation:

1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J → 5 × 3.6 × 10⁶ = 1.8 × 10⁷ J.

7.  
Which instrument measures the relative density of a liquid?

Correct Answer: A [Hydrometer]

Explanation:

Hydrometer = relative density of liquids; hygrometer = humidity, pyrometer = high temperature, manometer = gas pressure.

8.  
One watt is equal to:

Correct Answer: C [1 J/s]

Explanation:

Power = work ÷ time, so 1 W = 1 joule per second.

9.  
How many significant figures are there in 0.04060?

Correct Answer: D [4]

Explanation:

Leading zeros do not count; 4, the middle 0, 6 and the trailing 0 after the decimal point count → 4.

10.  
Fill in the blank1 coulomb = 1 ampere × 1 ____.

Correct Answer: A [second]

Explanation:

Charge = current × time, so C = A s.

11.  
Statement-basedConsider the statements:
I. The kelvin is the SI base unit of thermodynamic temperature.
II. The degree Celsius is an SI base unit.
Which is/are correct?

Correct Answer: B [Only I]

Explanation:

Kelvin is a base unit; °C is a derived unit of the same size.

12.  
The dimensional formula of velocity is:

Correct Answer: C [[LT⁻¹]]

Explanation:

Velocity = displacement ÷ time → [LT⁻¹].

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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