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General Science Mixed Quiz: Set 144

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

Set 144 of the General Science mixed quiz has 20 multiple-choice questions from 20 different topics of the subject: Light: Reflection and Refraction, Branches of Science and Their Fields of Study, Electricity and Magnetism and more. 18 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: NDA · NDA-II 2019, GATEasy

Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because

  1. A.the holes through the fibre are extremely fine.
  2. B.light rays are absorbed at the entry end and relieved at the exit end of the fibre.
  3. C.scattering of light occurs inside the fibre.
  4. D.successive total internal reflections occur as a ray moves through the fibre.
Show answer
Correct answer: D. successive total internal reflections occur as a ray moves through the fibre.

Light inside an optical fibre strikes the wall at more than the critical angle, is totally reflected back inside, and repeats this again and again along the fibre.

Q2.General ScienceEasy

Entomology is the study of

  1. A.The origin of words
  2. B.Insects
  3. C.Birds
  4. D.Human races
Show answer
Correct answer: B. Insects

Entomology is the branch of zoology that deals with insects, the largest class of animals, and it covers their structure, classification, life cycles and their role as pests and pollinators.

Q3.General ScienceAsked in: NDA · NDA-I 2023, GATMedium

A positive charge is moving towards south in a space where magnetic field is pointing in the north direction. The moving charge will experience :

  1. A.a deflecting force towards north direction.
  2. B.a deflecting force towards east direction.
  3. C.a deflecting force towards west direction.
  4. D.no deflecting force.
Show answer
Correct answer: D. no deflecting force.

The charge moves exactly opposite to the field, and a magnetic field exerts no force on a charge moving along its line.

Q5.General ScienceAsked in: NDA · NDA-I 2022, GATHard

Which one of the following is not an example of a redox reaction?

  1. A.AlCl3 + 3H2O → Al(OH)3 + 3HCl
  2. B.2NaH → 2Na + H2
  3. C.4Fe + 3O2 → 2Fe2O3
  4. D.CuSO4 + Zn → Cu + ZnSO4
Show answer
Correct answer: A. AlCl3 + 3H2O → Al(OH)3 + 3HCl

This is a hydrolysis reaction in which no element changes its oxidation number, so nothing is oxidised or reduced. A redox reaction is one in which one substance loses electrons (its oxidation number rises) and another gains them (its oxidation number falls).

Q6.General ScienceAsked in: NDA · NDA-II 2018, GATMedium

A stainless steel chamber contains Ar gas at a temperature T and pressure P. The total number of Ar atoms in the chamber is n. Now Ar gas in the chamber is replaced by CO₂ gas and the total number of CO₂ molecules in the chamber is n/2 at the same temperature T. The pressure in the chamber now is P'. Which one of the following relations holds true? (Both the gases behave as ideal gases)

  1. A.P' = P
  2. B.P' = 2P
  3. C.P' = P/2
  4. D.P' = P/4
Show answer
Correct answer: C. P' = P/2

For an ideal gas in a fixed volume at a fixed temperature, pressure is proportional to the number of molecules, so half the molecules give half the pressure.

Q10.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.

Q12.General ScienceAsked in: CDS · CDS-I 2020, GKEasy

The unit of the force constant k of a spring is

  1. A.N-m
  2. B.N/m
  3. C.N-m²
  4. D.N/m²
Show answer
Correct answer: B. N/m

The spring constant is force divided by extension, so its SI unit is newton per metre. Hooke's law says that, within the elastic limit, the restoring force of a spring is proportional to how far it is stretched or compressed: F = −kx.

Q13.General ScienceAsked in: NDA · NDA-I 2017, GATMedium

Red blood cells (RBCs) have

  1. A.no nucleus, no mitochondria and no endoplasmic reticulum
  2. B.nucleus, mitochondria and endoplasmic reticulum
  3. C.nucleus, mitochondria but no endoplasmic reticulum
  4. D.no mitochondria but endoplasmic reticulum is present
Show answer
Correct answer: A. no nucleus, no mitochondria and no endoplasmic reticulum

Mature human red blood cells lose these organelles as they develop. Red blood cells are made in the red bone marrow and push out their nucleus and other organelles before entering the blood.

Q14.General ScienceAsked in: CDS · CDS-II 2021, GKMedium

Fertilizers are used to obtain higher yields of crops. However, all nutrients are usually not available in fertilizers. Which one of the following nutrients is usually not available in fertilizers ?

  1. A.Iron
  2. B.Potassium
  3. C.Nitrogen
  4. D.Phosphorus
Show answer
Correct answer: A. Iron

Common fertilisers supply nitrogen, phosphorus and potassium (NPK); iron is a micronutrient that is usually not part of them. Plants need nitrogen, phosphorus and potassium in large amounts, so these are called primary macronutrients, and fertilisers such as urea, DAP, MOP and NPK mixtures are made to supply them.

Q15.General ScienceAsked in: NDA · NDA-II 2018, GATEasy

Which one of the following depicts the correct circuit of a reflex arc?

  1. A.Effector—sensory neuron—spinal cord—motor neuron—receptor
  2. B.Receptor—sensory neuron—spinal cord—motor neuron—effector
  3. C.Receptor—sensory neuron—brain—motor neuron—effector
  4. D.Sensory neuron—receptor—brain—effector—motor neuron
Show answer
Correct answer: B. Receptor—sensory neuron—spinal cord—motor neuron—effector

In a reflex arc the message runs from the sense organ to the spinal cord and straight back to a muscle or gland.

Q16.General ScienceAsked in: NDA · NDA-II 2019, GATMedium

A solid disc and a solid sphere have the same mass and same radius. Which one has the higher moment of inertia about its centre of mass?

  1. A.The disc
  2. B.The sphere
  3. C.Both have the same moment of inertia
  4. D.The information provided is not sufficient to answer the question
Show answer
Correct answer: A. The disc

About an axis through the centre, a solid disc has I = ½MR² while a solid sphere has I = ⅖MR², and ½ is larger than ⅖.

Q17.General ScienceAsked in: UPSC Civil Services · CSE Prelims 2023, GS Paper IEasy

'Wolbachia method' is sometimes talked about with reference to which one of the following?

  1. A.Controlling the viral diseases spread by mosquitoes
  2. B.Converting crop residues into packing material
  3. C.Producing biodegradable plastics
  4. D.Producing biochar from thermo-chemical conversion of biomass
Show answer
Correct answer: A. Controlling the viral diseases spread by mosquitoes

The method uses a natural bacterium to stop mosquitoes from passing on viruses. Wolbachia is a common bacterium that lives inside the cells of many insects.

Q18.General ScienceAsked in: NDA · NDA-II 2018, GATMedium

If one set of chromosomes for a given plant is represented as N; in case of double fertilization, the zygote and the endosperm nucleus of a diploid plant would have how many sets of chromosomes respectively?

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

The zygote is diploid (2N) and the primary endosperm nucleus is triploid (3N). Double fertilisation is a feature of flowering plants.

Q19.General ScienceAsked in: NDA · NDA-II 2026, GATMedium

Consider the following statements : I. A solution of iodine in ethanol known as 'tincture of iodine' is a heterogeneous mixture. II. A suspension is a heterogeneous mixture and its particles scatter a beam of light passing through it, making its path visible. III. A colloidal solution, although it appears homogeneous, is a heterogeneous mixture. 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: B. II and III only

Tincture of iodine is a true solution, which is homogeneous, so statement I is wrong, while II and III are right.

Q20.General ScienceAsked in: NDA · NDA-I 2018, GATMedium

Which of the following statements about a fluid at rest in a cup is/are correct? 1. Pressure is same at all the points in the fluid 2. Pressure is exerted on the walls. 3. Pressure exists everywhere in the fluid. Select the correct answer using the code given below :

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

A fluid at rest presses on the walls and has pressure at every point, but that pressure is not the same at all depths.

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