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General Science Mixed Quiz: Set 128

  • 20 questions
  • 20 minutes
  • Difficulty: Medium
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About this quiz

Set 128 of the General Science mixed quiz has 20 multiple-choice questions from 20 different topics of the subject: Motion, Force and the Laws of Motion, Human Body: Important Facts, Work, Energy and Power and more. 19 of them were asked in real previous-year papers. A topic quiz checks one chapter; this set revises the whole subject at once, the way an exam paper does, where the next question can come from any chapter. Every question carries an explanation of why the correct option is right and why the others are wrong. Keep to the timer, read the explanations at the end, and go back to the notes of any topic where you slipped.

Questions in this quiz

20 questions with answers and explanations

Q1.General ScienceAsked in: UPSC Civil Services · CSE Prelims 2023, GS Paper IMedium

Consider the following actions :

1. Detection of car crash/collision which results in the deployment of airbags almost instantaneously

2. Detection of accidental free fall of a laptop towards the ground which results in the immediate turning off of the hard drive

3. Detection of the tilt of the smartphone which results in the rotation of display between portrait and landscape mode

In how many of the above actions is the function of accelerometer required?

  1. A.Only one
  2. B.Only two
  3. C.All three
  4. D.None
Show answer
Correct answer: C. All three

An accelerometer measures acceleration, including the pull of gravity, and each of the three actions depends on reading it. An accelerometer is a small sensor, today usually a MEMS (micro-electro-mechanical system) chip, that senses changes in speed and the direction of gravity.

Q2.General ScienceMedium

Which structure is called the pacemaker of the human heart?

  1. A.Atrio-ventricular node
  2. B.Sino-atrial node
  3. C.Bundle of His
  4. D.Purkinje fibres
Show answer
Correct answer: B. Sino-atrial node

The sino-atrial node is a small patch of specialised muscle tissue in the wall of the right atrium near the opening of the superior vena cava, and it generates the impulse that sets the rate of each heartbeat without any outside stimulus, which is why it is called the pacemaker.

Q3.General ScienceAsked in: NDA · NDA-II 2025, GATMedium

Suppose, a ball of mass M is thrown upwards from a point A and it reaches up to the highest point B and returns back to point A, which one among the following is correct?

  1. A.Kinetic Energy at A = Potential Energy at B
  2. B.Kinetic Energy at A = Potential Energy at A
  3. C.Kinetic Energy at B = Potential Energy at B
  4. D.Kinetic Energy at B = Kinetic Energy at A
Show answer
Correct answer: A. Kinetic Energy at A = Potential Energy at B

Taking A as the reference level and ignoring air resistance, all the kinetic energy given at A turns into potential energy at the top, B. Mechanical energy is conserved when only gravity does work.

Q4.General ScienceAsked in: UPSC Civil Services · CSE Prelims 2016, GS Paper IMedium

With reference to pre-packaged items in India, it is mandatory to the manufacturer to put which of the following information on the main label, as per the Food Safety and Standards (Packaging and Labelling) Regulations, 2011? 1. List of ingredients including additives 2. Nutrition information 3. Recommendations, if any, made by the medical profession about the possibility of any allergic reactions 4. Vegetarian/ non-vegetarian Select the correct answer using the code given below.

  1. A.1, 2 and 3
  2. B.2, 3 and 4
  3. C.1, 2 and 4
  4. D.1 and 4 only
Show answer
Correct answer: C. 1, 2 and 4

The 2011 FSSAI labelling rules made the list of ingredients, nutrition information and the vegetarian or non-vegetarian mark compulsory, but not medical advice on allergies.

Q5.General ScienceAsked in: NDA · NDA-I 2020, GATEasy

A liquid is kept in a glass beaker. Which one of the following statements is correct regarding the pressure exerted by the liquid column at the base of the beaker ?

  1. A.The pressure depends on the area of the base of the beaker
  2. B.The pressure depends on the height of liquid column
  3. C.The pressure does not depend on the density of the liquid
  4. D.The pressure neither depends on the area of the base of the beaker nor on the height of liquid column
Show answer
Correct answer: B. The pressure depends on the height of liquid column

Liquid pressure at a depth is P = hρg, so a taller column presses harder on the base. In P = hρg, h is the height of the liquid above the point, ρ is the density of the liquid and g is the acceleration due to gravity.

Q6.General ScienceAsked in: NDA · NDA-II 2023, GATMedium

In a sexually reproducing organism, which one of the following statements is appropriate both for the parent and offspring?

  1. A.Chromosome number increases but DNA content remains constant
  2. B.Both chromosome number and DNA content remains constant
  3. C.Chromosome number decreases but DNA content remains constant
  4. D.Both chromosome number and DNA content decreases
Show answer
Correct answer: B. Both chromosome number and DNA content remains constant

Meiosis halves them in the gametes, and fertilisation restores them in the offspring. Each parent makes gametes by meiosis, so a human egg or sperm carries 23 chromosomes instead of 46.

Q7.General ScienceAsked in: NDA · NDA-I 2021, GATEasy

Which one of the following statements is not correct for light rays?

  1. A.Light travels at different speeds in different media.
  2. B.Light travels at almost 300 million metres per second in air.
  3. C.Light speeds down as it leaves a water surface and enters the air.
  4. D.Light speeds up as it leaves a glass surface and enters the air.
Show answer
Correct answer: C. Light speeds down as it leaves a water surface and enters the air.

Air is optically rarer than water, so light speeds up, not slows down, when it passes from water into air.

Q8.General ScienceAsked in: NDA · NDA-II 2026, GATMedium

A bicycle racing track is a level circular road of radius 10 m. Three cyclists P, Q and R with identical cycles are cycling on the track with speeds 2 m/s, 3 m/s and 5 m/s respectively. If the coefficient of friction between the tyres and the road is 0.1, then which cyclist will slip? (Take g = 10 m/s²)

  1. A.P only
  2. B.Q only
  3. C.R only
  4. D.All will slip
Show answer
Correct answer: C. R only

On a level curve, friction alone supplies the centripetal force, so a cyclist slips when the needed force exceeds the maximum friction.

Q9.General ScienceAsked in: NDA · NDA-I 2020, GATEasy

Which of the following statements is NOT correct regarding the travel of sound waves?

  1. A.Sound waves can travel through water
  2. B.Sound waves can travel through air
  3. C.Sound waves can travel through steel
  4. D.Sound waves can travel through vacuum
Show answer
Correct answer: D. Sound waves can travel through vacuum

Sound is a mechanical wave that needs a medium, so it cannot pass through empty space. Sound travels as a series of compressions and rarefactions passed from particle to particle of a medium.

Q10.General ScienceAsked in: UPSC CAPF · CAPF 2019, Paper IEasy

Which of the following are the most favourable conditions for liquefying a gas ?

  1. A.Low pressure and high temperature
  2. B.Low pressure and low temperature
  3. C.High pressure and high temperature
  4. D.High pressure and low temperature
Show answer
Correct answer: D. High pressure and low temperature

High pressure pushes the gas molecules close together and low temperature slows them down, so the attractive forces can hold them as a liquid.

Q11.General ScienceAsked in: CDS · CDS-II 2017, GKHard

After using for some time, big transformers get heated up. This is due to the fact that

1. current produces heat in the transformers

2. hysteresis loss occurs in the transformers

3. liquid used for cooling gets heated

Select the correct answer using the code given below.

  1. A.1 only
  2. B.2 and 3 only
  3. C.1 and 2 only
  4. D.1, 2 and 3
Show answer
Correct answer: C. 1 and 2 only

A transformer heats up because of energy lost inside it: heat from current in the windings and hysteresis loss in the iron core.

Q14.General ScienceAsked in: UPSC CAPF · CAPF 2020, Paper IMedium

Which one of the following statements on photoelectric effect is NOT correct ?

  1. A.Albert Einstein received the Nobel Prize in Physics for explaining photoelectric effect
  2. B.For each metal, there is a threshold frequency ν₀ below which this effect is not observed
  3. C.At a frequency ν > ν₀, the kinetic energy of ejected electrons does not change on increasing the frequency of incident light
  4. D.The number of electrons ejected is proportional to the intensity of incident light
Show answer
Correct answer: C. At a frequency ν > ν₀, the kinetic energy of ejected electrons does not change on increasing the frequency of incident light

Above the threshold, the kinetic energy of the ejected electrons rises as the frequency of the light rises, so the statement that it does not change is wrong.

Q15.General ScienceAsked in: NDA · NDA-II 2026, GATHard

Consider the following statements regarding oxidation numbers : I. The oxidation number of oxygen in peroxides and superoxides is assigned as -1 and -1/2 respectively. II. In all its compounds, fluorine has an oxidation number of -1. III. In a reduction half-reaction, the oxidation number of the reductant decreases. Which of the statements given above are correct?

  1. A.I and II only
  2. B.II and III only
  3. C.I and III only
  4. D.I, II and III
Show answer
Correct answer: A. I and II only

Statements I and II are standard rules for oxidation numbers, but Statement III reverses what happens to a reducing agent.

Q19.General ScienceAsked in: NDA · NDA-II 2018, GATMedium

Which one of the following statements is not correct?

  1. A.All carbons in diamond are linked by carbon-carbon single bond.
  2. B.Graphite is layered structure in which layers are held together by weak van der Waals forces.
  3. C.Graphite layers are formed by hexagonal rings of carbon atoms.
  4. D.Graphite layers are held together by carbon-carbon single bond.
Show answer
Correct answer: D. Graphite layers are held together by carbon-carbon single bond.

The layers of graphite are held only by weak van der Waals forces, not by covalent bonds. Diamond and graphite are allotropes of carbon.

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