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Karnataka Police Constable Physics — practice questions

Explore 24 free Physics questions in Karnataka Police Constable Science. Open each question or exercise to read its content, reference answers and available explanation.

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Physics questions and exercises with answers

Showing questions 1–24 of 24.

Which instrument is used to find out wind direction?Read the answer and worked solution →Which India-born physicist is credited with inventing the optical fibre?Read the answer and worked solution →What is the freezing point of water on the Fahrenheit scale?Read the answer and worked solution →Friction can be reduced by changing from:Read the answer and worked solution →The escape velocity of a rocket fired from the Earth is the velocity needed to overcome the:Read the answer and worked solution →The SI unit of force is the:Read the answer and worked solution →The free surface of a liquid tends to contract to the smallest possible area due to the:Read the answer and worked solution →In an electric circuit, a rheostat is commonly used to change which of the following quantities?Read the answer and worked solution →The time period of a vibrating body is 0.04 s. What is the frequency of the wave produced?Read the answer and worked solution →What is the scientific term for the speed of an object moving in a definite direction?Read the answer and worked solution →An object of mass 13 kg moves with a uniform velocity of 5 m/s. What is its kinetic energy?Read the answer and worked solution →Which of the following represents the equation for the position-time relation in uniformly accelerated motion?Read the answer and worked solution →Which of the following laws is associated with the heating effect of electric current?Read the answer and worked solution →The force of gravitation between two bodies in the universe does NOT depend on:Read the answer and worked solution →Which of the following types of energy varies with the height of an object?Read the answer and worked solution →In case of hypermetropia (far-sightedness), where is the image of a nearby object formed?Read the answer and worked solution →How is 'power' defined in physics?Read the answer and worked solution →An object starts from rest and attains a speed of 5 m/s in 2 seconds. What is its acceleration?Read the answer and worked solution →The product of force and displacement is called:Read the answer and worked solution →A 1 kg object is dropped to the ground from a height of 30 m. The work done by the force of gravity will be (take g = 10 m/s²):Read the answer and worked solution →Mechanical energy is:Read the answer and worked solution →A 10 kg object is moving at a speed of 5 m/s. The kinetic energy of the object will be:Read the answer and worked solution →An object is placed in front of a concave mirror at a point between its focal point and centre of curvature. The image formed will be:Read the answer and worked solution →Free fall is possible only in:Read the answer and worked solution →

Worked practice questions

Which instrument is used to find out wind direction?

  1. Wind vane
  2. Hygrometer
  3. Anemometer
  4. Wind gauge
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Correct answer: A. Wind vane

1. A hygrometer measures humidity and an anemometer measures wind speed. 2. A wind vane is a pointer that turns freely and aligns with the blowing wind. 3. Therefore a wind vane is used to determine wind direction. _Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.8._

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Which India-born physicist is credited with inventing the optical fibre?

  1. C.V. Raman
  2. Narinder Singh Kapany
  3. Satyendra Nath Bose
  4. Homi J. Bhabha
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Correct answer: B. Narinder Singh Kapany

1. C.V. Raman, S.N. Bose and Homi Bhabha worked in spectroscopy, statistics and nuclear physics. 2. Narinder Singh Kapany pioneered the practical use of optical fibres. 3. He is widely called the 'Father of Fibre Optics', so the answer is Kapany. _Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.16._

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What is the freezing point of water on the Fahrenheit scale?

  1. 212°F
  2. 100°F
  3. 32°F
  4. 180°F
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Correct answer: C. 32°F

1. Water freezes at 0°C on the Celsius scale. 2. Convert using F = (C × 9/5) + 32 = (0 × 9/5) + 32. 3. This gives 32°F as the freezing point. _Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.19._

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