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General Science GK Questions with Answers – Page 84

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General Science multiple choice questions with answers and explanations, 20 per page, for SSC, Banking, UPSC, Railway and state exams.

2541 questions

General Science NotesOnly previous-year questions (1911)GK Quiz
Q1661.General ScienceAsked in: NDA · NDA-II 2023, GATEasy

The potential difference between the two end terminals of an electric heater is 220 V and the current through it is 0.5 A. What would be the current through the heater if the potential difference across the terminals of the heater is reduced to 120 V?

  1. A.1.0 A
  2. B.0.5 A
  3. C.0.27 A
  4. D.0.7 A
Show answer
Correct answer: C. 0.27 A

The heater's resistance is 220/0.5 = 440 Ω, so at 120 V the current is 120/440, about 0.27 A. By Ohm's law, V = IR, and for an ohmic conductor at a steady temperature the resistance stays the same.

Q1662.General ScienceAsked in: NDA · NDA-II 2024, GATEasy

Which of the following two cell organelles have their own genetic material ?

  1. A.Endoplasmic reticulum and plastids
  2. B.Endoplasmic reticulum and mitochondria
  3. C.Mitochondria and plastids
  4. D.Lysosomes and Golgi apparatus
Show answer
Correct answer: C. Mitochondria and plastids

Both carry their own DNA and ribosomes and can make some of their own proteins. Mitochondria, the powerhouses of the cell, and plastids such as chloroplasts each contain a small circular DNA molecule and 70S ribosomes, much like bacteria.

Q1663.General ScienceAsked in: NDA · NDA-II 2025, GATEasy

The rule to determine the direction of a force experienced by a straight current carrying conductor placed in a magnetic field which is perpendicular to it is

  1. A.Right-hand thumb rule
  2. B.Fleming's left-hand rule
  3. C.Fleming's right-hand rule
  4. D.Hund's rule
Show answer
Correct answer: B. Fleming's left-hand rule

It gives the direction of the force on a current-carrying conductor placed in a magnetic field. Stretch the thumb, forefinger and middle finger of the left hand so that they are mutually perpendicular.

Q1664.General ScienceAsked in: NDA · NDA-I 2026, GATMedium

Two forces of equal magnitude simultaneously act at a point. It is observed that the resultant force is equal in magnitude to the individual forces. Which of the following statements is/are correct? I. The angle between one of the individual forces and the resultant force is π/3. II. The angle between the individual forces is 2π/3. Select the answer using the code given below.

  1. A.I only
  2. B.II only
  3. C.Both I and II
  4. D.Neither I nor II
Show answer
Correct answer: C. Both I and II

Two equal forces give a resultant of the same size only when they are 120° apart, and the resultant then makes 60° with each.

Q1665.General ScienceAsked in: NDA · NDA-II 2026, GATEasy

The bob of a simple pendulum is displaced from its mean position and then released from rest 0.20 m above its mean position. What is the speed of the bob as it passes through the mean position? (Take g = 10 m/s²)

  1. A.0 m/s
  2. B.1 m/s
  3. C.2 m/s
  4. D.√10 m/s
Show answer
Correct answer: C. 2 m/s

All the potential energy at the top turns into kinetic energy at the mean position, so v = √(2gh) = √(2 × 10 × 0.20) = 2 m/s. When the bob is released from rest at height h, it has potential energy mgh and no kinetic energy.

Q1667.General ScienceAsked in: NDA · NDA-I 2018, GATMedium

Which one of the following statements is correct ?

  1. A.Any energy transfer that does not involve temperature difference in some way is not heat
  2. B.Any energy transfer always requires a temperature difference
  3. C.On heating the length and volume of the object remain exactly the same
  4. D.Whenever there is a temperature difference, heat is the only way of energy transfer
Show answer
Correct answer: A. Any energy transfer that does not involve temperature difference in some way is not heat

Heat, by definition, is energy that flows because of a temperature difference. Thermodynamics recognises two ways in which a system can exchange energy with its surroundings: heat and work.

Q1669.General ScienceAsked in: NDA · NDA-II 2019, GATMedium

A thin disc and a thin ring, both have mass M and radius R. Both rotate about axes through their center of mass and are perpendicular to their surfaces at the same angular velocity. Which of the following is true?

  1. A.The ring has higher kinetic energy
  2. B.The disc has higher kinetic energy
  3. C.The ring and the disc have the same kinetic energy
  4. D.Kinetic energies of both the bodies are zero since they are not in linear motion
Show answer
Correct answer: A. The ring has higher kinetic energy

Rotational kinetic energy is ½Iω², and the ring has the larger moment of inertia. For a thin ring about the axis through its centre and perpendicular to its plane, all the mass sits at distance R, so I = MR².

Q1670.General ScienceAsked in: NDA · NDA-I 2021, GATEasy

Consider the following statements about Light year : 1. Light year is a unit for measurement of very large distances. 2. Light year is a unit for measurement of very large time intervals. 3. Light year is a unit for measurement of intensity of light. Which of the statements given above is/are correct ?

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

A light year is a unit of distance, not of time or brightness. One light year is the distance light travels through a vacuum in one Julian year.

Q1672.General ScienceAsked in: NDA · NDA-II 2023, GATEasy

The streaming of light beams coming from the Sun through trees is said to have suggested that light travels in straight line. The particles on the path of light beams are visible to us because

  1. A.dust particles in the air reflect light into our eyes
  2. B.dust particles in the air scatter light into our eyes
  3. C.dust particles in the air refract light into our eyes
  4. D.dust particles in the air polarize light into our eyes
Show answer
Correct answer: B. dust particles in the air scatter light into our eyes

A beam seen from the side is visible only because tiny particles send some of its light sideways. Light travelling in a straight line cannot enter our eyes unless something redirects it towards us.

Q1674.General ScienceAsked in: NDA · NDA-I 2026, GATHard

A pendulum of length L oscillates with an angular amplitude of θ = 60° and time period T. Let T₀ = 2π√(L/g) be the time period for small angle of oscillations, where g is the acceleration due to gravity. If air resistance is negligibly small and the string remains straight, then which one of the following is correct?

  1. A.T will be slightly greater than T₀.
  2. B.T will be slightly smaller than T₀.
  3. C.T will be exactly equal to T₀.
  4. D.T will depend upon the mass of the bob.
Show answer
Correct answer: A. T will be slightly greater than T₀.

The formula T₀ = 2π√(L/g) holds only for small swings; at large amplitudes the period grows.

Q1675.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.

Q1676.General ScienceAsked in: CDS · CDS-I 2020, GKMedium

Which one of the following chemical reactions is not feasible?

  1. A.Fe + CuSO4 → FeSO4 + Cu
  2. B.Zn + CuSO4 → ZnSO4 + Cu
  3. C.Cu + PbCl2 → CuCl2 + Pb
  4. D.Mg + CuSO4 → MgSO4 + Cu
Show answer
Correct answer: C. Cu + PbCl2 → CuCl2 + Pb

Copper is less reactive than lead, so it cannot push lead out of its compound. In a displacement reaction, a more reactive metal takes the place of a less reactive metal in its salt solution.

Q1679.General ScienceAsked in: CDS · CDS-I 2023, GKMedium

A leaf was plucked from a plant on a sunny day and kept for 2 minutes in boiling water. It was subsequently immersed in boiling alcohol and treated with iodine solution. What will be the final colour of the leaf after the test?

  1. A.Colourless
  2. B.Green
  3. C.Blue
  4. D.White
Show answer
Correct answer: C. Blue

A leaf from a sunny day is full of starch made by photosynthesis, and iodine turns starch blue-black. This is the standard school test for starch in a leaf.