General Science Questions (MCQs) for Competitive Examinations

General Science Multiple choice questions for GK paper in SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations.

31. Which of the following are the areas of application of Doppler’s effect?

[A] At airports to guide aircraft
[B] in the military to detect enemy aircraft
[C] Sonography
[D] All of the above

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32. What do we call the distance between two consecutive compressions of a sound wave?

[A] Wave number
[B] Frequency
[C] Wavelength
[D] Amplitude

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33. What is supersonic speed?

[A] When the speed of any object exceeds the speed of sound
[B] When the speed of any object exceeds the speed of light
[C] When the speed of any object exceeds 10000 m/s
[D] None of the above

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34. Which of the following is true about a concave lens?

[A] power of a concave lens is positive
[B] power of a concave lens is negative
[C] power of a concave lens is zero
[D] None of the above

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35. Which of the following phenomenon is the basis of an electric generator?

[A] Electromagnetic Induction
[B] Ferroelectric effect
[C] Telluric currents
[D] Electroluminescence

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36. Which of these diodes convert electrical energy into light?

[A] Photodiodes
[B] Light emitting diodes
[C] Photovoltaic devices
[D] None

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37. Which of the following is correct about conductors?

[A] The conduction band and the valence band partly overlap each other
[B] There is no forbidden energy band gap between conduction band and the valence band
[C] Both a and b
[D] None of the above

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38. Which of the following is the purest form of Iron?

[A] Pig iron
[B] Cast iron
[C] Wrought iron
[D] None of the above

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39. What do we call the difference between the initial mass energy and the total mass energy of the decay products in a radioactive decay?

[A] entropy
[B] disintegration energy
[C] alpha energy
[D] integration energy

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40. What is the shape of SF4 molecule?

[A] Bent
[B] See-saw
[C] Trigonol Pyramidal
[D] T-shape

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