MCQ
General Science MCQ - Practice Questions with Answers
Solve 109 General Science questions for RAS/RPSC preparation.
Practice questions
Q1Which one of the following is not correctly matched?
For red-cell transfusion, the universal donor blood type is O negative, not AB positive. Therefore the pair "AB+ blood group - Universal Donor" is the mismatched pair. Hence D is correct.
Q2Consider the given statements I and II and select the correct option using the codes given below : Statement I : Natural Greenhouse effect is essential for sustenance of life on earth. Statement II : Ozone present in the troposphere helps mitigate the effect of UV radiations.
The natural greenhouse effect keeps Earth's surface warm enough for life, so Statement I is true. Protection from harmful ultraviolet radiation is mainly due to the stratospheric ozone layer, while tropospheric or ground-level ozone is treated as a pollutant. Therefore Statement II is false, and option C is correct.
Q3Which fungus causes ‘black fungus’ disease ?
Mucormycosis, often called black fungus, is caused by molds of the order Mucorales. Mucor is one of the causative genera, while Lycopodium is a plant, Penicillium is not the usual cause of mucormycosis, and Leptospira is a bacterium. Therefore option A is correct.
Q4Which of the following is not a Hot Wind ?
Bora is defined by Britannica as a very strong cold wind of the Adriatic region. Sirocco, Zonda and Khamsin are treated as warm or hot local winds in standard geography references. Thus the wind that is not hot is Bora, so option D is correct.
Q5Consider the following statements regarding amplitude modulation and choose the correct option : Statement A : Amplitude modulated waves can be produced by application of the message signal and the carrier wave to a non-linear device, followed by a band pass filter. Statement B : For sinusoidal message signal, amplitude modulated wave contains frequencies ω_m, 2ω_m and ω_c, each of same amplitude.
An AM wave can be produced by applying the message signal and carrier wave to a non-linear device and then selecting the required band with a band-pass filter, so Statement A is true. After filtering, the AM wave contains the carrier and the two sideband frequencies, not ωm, 2ωm and ωc each with the same amplitude. Therefore only Statement A is true, so B is correct.
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