Physics - Questions and Answers, General Study (GK)

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171.

X-rays are not used for radar purpose because

(a)they are completely absorbed by air

(b)they are not reflected by the target

(c)they are not electromagnetic wave

(d)none of the above

Comment

Answer is: BNA

172.

X-rays were discovered by

(a)Becquerel

(b)Curie

(c)Roentgen

(d)Van lane

Comment

Answer is: CNA

173.

Which one of the following is not electromagnetic?

(a)Cathode rays

(b)X-rays

(c)Gamma rays

(d)Infrared days

Comment

Answer is: ANA

174.

Consider the following parts of spectra
1. Visible
2. Infrared
3. Ultraviolet
4. Microwave
Which one of the following is the correct sequence in which their wavelengths increase?

(a)4-3-1-2

(b)4-1-2-3

(d)3-1-2-4

Comment

Answer is: DNA

175.

Electromagnetic waves can travel through

(a)a medium such as air and water

(b)space where there are no electric and magnetic field

(c)electric field or magnetic field

(d)both (a) and (b)

Comment

Answer is: DNA

176.

Who firstly demonstrated experimentally the existence of electromagnetic wave?

(a)Hertz

(b)Romar

(c)Marconi

(d)Maxwell

Comment

Answer is: DNA

177.

Which one of the following types of glass can cut of ultraviolet rays?

(a)soda glass

(b)crooked glass

(c)pyrex glass

(d)jena glass

Comment

Answer is: BNA

178.

The audible frequency range of a human ear is

(a)20 Hz to 200 Hz

(b)2 Hz to 20 Hz

(d)20 Hz to 2000 Hz

Comment

Answer is: DNA

179.

Ultrasonic waves are those waves which

(a)human beings can hear

(b)human beings cannot hear

(c)have high velocity

(d)have large amplitude

Comment

Answer is: BNA

180.

With the rise of temperature, the speed of sound in a gas

(a)decreases

(b)increases

(c)remains the same

(d)infinite

Comment

Answer is: BNA

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Physics - Questions and AnswersPage 18

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