The temperature of a body is 86°F. What is it in Celsius? MCQ with Answer and Explanation

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The temperature of a body is 86°F. What is it in Celsius?

A. 20°C

B. 40°C

C. 25°C

D. 30°C

Answer: Option D

Solution (By JKSSB Mock Tests)

C = (F-32) × 5/9 = (86-32)×5/9 = 54×5/9 = 30°C. Common conversion. 86°F warm day. 32°F = 0°C.

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Question #1

The nucleus of an atom consists of

A. Protons and neutrons

B. Only protons

C. Electrons and protons

D. Electrons and neutrons

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Correct Answer: Option A

Explanation:
Nucleus contains protons (positive) and neutrons (neutral), collectively nucleons. Electrons orbit nucleus. Atomic number Z = protons, mass number A = protons + neutrons. Isotopes differ in neutron number.

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Question #2

Temperature where Fahrenheit reading is double Celsius reading:

A. 40°C

B. 80°C

C. 320°C

D. 160°C

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Correct Answer: Option D

Explanation:
F = (9/5)C + 32. Given F = 2C: 2C = 1.8C + 32 ⇒ 0.2C = 32 ⇒ C = 160°. Verify: F = 2×160 = 320°; formula: (9/5)×160+32 = 288+32 = 320°. Memory aid: Solve linear equation for temperature conversion problems. Algebraic manipulation of scale relations frequently tested in competitive exams.

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Question #3

The radius of curvature of a convex mirror of focal length 20 cm is

A. 40 cm

B. 10 cm

C. 20 cm

D. 30 cm

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Correct Answer: Option A

Explanation:
R = 2f = 40 cm. For convex, f positive, R positive.

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