26. The recoil of a rifle when fired is explained by Newton's:
- second law
- first law
- law of gravitation
- third law
Answer: D) third law
Explanation: Action and reaction.
MCQs / General Science / General Science for Initial Tests
General Science for Initial Tests MCQs — General Science (page 2)
49 multiple-choice questions on General Science for Initial Tests from General Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
27. Penicillin was discovered by:
- Louis Pasteur
- Jonas Salk
- Alexander Fleming
- Edward Jenner
Answer: C) Alexander Fleming
Explanation: In 1928.
28. Sound cannot travel through:
- air
- steel
- water
- a vacuum
Answer: D) a vacuum
Explanation: Sound needs a medium.
29. The chemical formula of common salt is:
- NaOH
- KCl
- NaCl
- CaCO₃
Answer: C) NaCl
Explanation: Sodium chloride.
30. The "Red Planet" is:
- Mars
- Venus
- Mercury
- Jupiter
Answer: A) Mars
Explanation: Mars.
31. Insulin is produced by the:
- heart
- pancreas
- liver
- kidney
Answer: B) pancreas
Explanation: Islets of Langerhans in the pancreas.
32. A pH of 7 indicates a:
- strong base
- neutral solution
- strong acid
- salt only
Answer: B) neutral solution
Explanation: pH 7 is neutral.
33. The SI unit of force is:
- joule
- pascal
- newton
- watt
Answer: C) newton
Explanation: Force in newtons.
34. The universal blood donor group is:
- AB positive
- A positive
- O negative
- B negative
Answer: C) O negative
Explanation: O negative.
35. Dengue is spread by the:
- Anopheles mosquito
- Aedes mosquito
- tick
- housefly
Answer: B) Aedes mosquito
Explanation: Aedes aegypti.
36. The "brain" of a computer is the:
- CPU
- keyboard
- monitor
- printer
Answer: A) CPU
Explanation: Central Processing Unit.
37. Submarines detect objects underwater using:
- sonar
- radar
- infrared only
- X-rays
Answer: A) sonar
Explanation: Sonar uses sound waves.
38. Acids turn blue litmus:
- yellow
- blue
- red
- green
Answer: C) red
Explanation: Acids redden blue litmus.
39. The most abundant gas in Earth's atmosphere is:
- carbon dioxide
- argon
- oxygen
- nitrogen
Answer: D) nitrogen
Explanation: About 78%.
40. The speed of sound in air is about:
- 3 × 10⁸ m/s
- 34 m/s
- 340 m/s
- 3,400 km/s
Answer: C) 340 m/s
Explanation: About 340 m/s at room temperature.
41. Normal human body temperature is about:
- 100 °C
- 37 °C
- 30 °C
- 40 °C
Answer: B) 37 °C
Explanation: 37 °C or 98.6 °F.
42. The first successful powered aeroplane was flown by:
- Edison
- Einstein
- the Wright brothers
- Marconi
Answer: C) the Wright brothers
Explanation: In 1903.
43. The polio vaccine was developed by:
- Louis Pasteur
- Alexander Fleming
- Jonas Salk
- Edward Jenner
Answer: C) Jonas Salk
Explanation: Inactivated polio vaccine, 1955.
44. The World Wide Web was invented by:
- Steve Jobs
- Tim Berners-Lee
- Charles Babbage
- Bill Gates
Answer: B) Tim Berners-Lee
Explanation: At CERN, 1989.
45. The telephone was invented by:
- Newton
- Thomas Edison
- Alexander Graham Bell
- Marconi
Answer: C) Alexander Graham Bell
Explanation: In 1876.
46. The atomic number of an element equals the number of:
- electrons plus neutrons
- protons
- neutrons
- molecules
Answer: B) protons
Explanation: Protons in the nucleus.
47. The largest organ of the human body is the:
- skin
- heart
- brain
- liver
Answer: A) skin
Explanation: Skin.
48. The first human in space was:
- Alan Shepard
- Valentina Tereshkova
- Yuri Gagarin
- Neil Armstrong
Answer: C) Yuri Gagarin
Explanation: 1961.
49. The hardest natural substance is:
- iron
- gold
- diamond
- quartz
Answer: C) diamond
Explanation: Diamond.
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