General Science MCQs and Answers: General Science are very important for OPSC, OSSC, OSSSC & Other State Exams. Aspirants who are willing to apply for the various Government exams in 2022 must go through the topics of General Science for competitive exams, as General Science is a key part of the syllabus.
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Q1. Therm is the unit of the?
(a) Power.
(b) Heat.
(c) Light.
(d) Distance.
S1. (b)
Sol.
- Therm is the non SI unit of the heat, Just as the Celsius and the Fahrenheit are of the temperature.
Q2. At what temperature the water converts into the water vapour?
(a) 273 k.
(b) 100 k.
(c) 373 k.
(d) 0 k.
S2. (C)
Sol.
- At 373 k temperature water converts into the water vapour.
Q3. What is found in the frequency modulation?
(a) Fixed frequency.
(b) Fixed dimension.
(c) Change in the frequency and the dimension.
(d) change in the dimension only.
S3. (b)
Sol.
- In frequency modulation, the frequency of the signal is varied whereas amplitude is kept the constant.
Q4. When two semi conductors of p and n- type are bought in contact, they form p- n junction which acts like a/an?
(a) Rectifier.
(b) Amplifier.
(c) Oscillator.
(d) Conductor.
S4. (a)
Sol.
- A Rectifier is an electronic device that converts an alternating current into a. Direct current by using one or more P-N junction diodes.
Q5. The damage of the human body is due to the radiation is measured in the?
(a) Rems.
(b) Roentgen.
(c) Curei.
(d) Rads.
S5. (d)
Sol.
- Rads refer to the radiation absorbed doses.
- It is the amount of the energy carried by the radiation that gets absorbed by the body tissues.
Q6. The radiation initially produced in the fluorescent tube is the?
(a) Infrared.
(b) Ultraviolet.
(c) Microwaves.
(d) X- rays.
S6.(b)
Sol.
- Flourescent tube emits ultraviolet radiation.
- Due to this flourescent tubes cause various health risk to the human’s.
Q7. Forged documents are detected by the?
(a) Ultraviolet rays.
(b) Infrared rays.
(c) Beta rays.
(d) Gamma rays.
S7. (a)
Sol.
- Documents that are authentic, will glow when Illuminated by the ultraviolet radiation.
Q8. Magnifying glass is basically a ?
(a) Plano – concave lens.
(b) Concave lens.
(c) Convex lens.
(d) Cylindrical lens.
S8. (C)
Sol.
- A magnifying glass is a convex lens.
- It produces a magnified image of an object.
Q9. The working principle of a beam balance is the principle of?
(a) mass.
(b) momentum.
(c) Couple.
(d) moment.
S9.(d)
Sol.
- Beam balance works on the principle of the moments.
- When Torque on both the arm’s is balanced it comes to an stable State.
Q10. The head mirror used by the ENT doctors is?
(a) concave.
(b) convex.
(c) plane.
(d) Plano- convex.
S10.(a)
Sol.
- Concave mirrors form magnified image.
- Due to this, concave mirrors are used in the head mirror of the ENT specialists.
Q11. Which of the following has the lowest frequency?
(a) Visible ray.
(b) Gamma ray.
(c) X-ray.
(d) ultraviolet rays.
S11. (a)
Sol.
- The electromagnetic spectrum is in order of increasing frequencies:–
- Radiowaves, microwave, infrared waves, visible light, ultraviolet waves, X-ray, and Gamma ray.
Q12. Which of the following colour of light deviates least through the prism?
(a) yellow.
(b) Green.
(c) violet.
(d) red.
S12.(d)
Sol.
- The smaller the wavelength the larger will be the deviation.
- As the Red light has largest wavelength, it deviates the least.
Q13. Which of the following does not have any effect on velocity of sound?
(a) Pressure.
(b)Temperature.
(c)Humidity.
(d) Density.
S13. (a)
Sol.
- Velocity of the sound wave depends upon the temperature, density of medium in which it is traveling.
- It also depends on moisture content in medium.
Q14.The layer of atmosphere used for radio-wave transmission is?
(a)Chromospheres.
(b) troposphere.
(c) ionosphere.
(d) stratosphere.
S14. (C)
Sol.
- The layer of the atmosphere that reflects radio waves is the ionosphere.
- The ionosphere is defined as the layer of the earth’s atmosphere that is ionized by solar and cosmic radiation.
Q15. Submerged objects can be located using?
(a) Radar.
(b)sonar
(c) Quasar.
(d) Pulsar.
S15. (b)
Sol.
- Sonar is used to navigate, communicate with or detect objects in or under the surface of water.
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