Physics General Studies Questions for ssc upsc competitive examspage 13

181 .Critical angle of light passing from glass to water is minimum for

A. interference

B. total reflection

C. scattering

D. double refraction

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182 .Instrument used to study the behavior of a vibrating string is:

A. Hygrometer

B. Sonmeter

C. Barometer

D. Hydrometer

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183 .X - rays are used for the study of crystal structure because

A. X- rays are completely absorbed by the crystal

B. The wavelength of X â€“ rays is of the same order of magnitude as the interatomic spacing in crystals

C. The wavelength of X â€“ rays is very small in comparison with the interatomic spacing in crystals

D. The crystals are completely transparent to X â€“ rays

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184 .In a healthy human eye, the focusing is done by the

A. To and from movement of the eye lens

B. Changing curvature of the retina

C. Change in the convexity of the lens throught ciliary muscles

D. Change in the refractive index of the eye fluid

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185 .Decibel is the unit used for measuring

A. Speed of light

B. Intensity of heat

C. Intensity of sound

D. Radiowave frequency

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186 .A digita signal:

A. is less reliable than analog signal

B. is more reliable than analog signal

C. is equally reliable as the analog signal

D. None of the above

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187 .The 'greenhouse effect' refers to:

A. Increasing agricultural yields

B. Gradual warming of the earth's surface

C. Build-up of toxic airborne pollutants

D. Reduction in the earth's ozone layer

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188 .The resistance of a wire is R. It is stretched uniformly so that its length is doubled. The resistance now becomes

A. 2R

B. R/2

C. 4 R

D. R/4

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189 .Consider the followingelectromagnetic waves
1. X- rays
2. Y Rays
3. Microwaves
4. Radio waves
What is the correct sequence in the orderof their increasing energy?

A. 4, 3, 1 and 2

B. 1, 3, 2 and 4

C. 4, 2, 1 and 3

D. 1, 4, 3 and 2

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190 .The core of an electromagnet is made of soft iron because soft iron has

A. small susceptibility and small retentivity

B. large susceptibility and small retentivity

C. large density and large retentivity

D. small density and large retentivity

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191 .The quality of sound produced by an instrument depends on the

A. frequency

B. intensity

C. number of overtones

D. none of these

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192 .The concentration of pollutants in atmosphere is generally expressed in:

A. Parst per billion

B. Kilogram per square metre

C. Parts per trillion

D. Parst per million

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193 .The largest ecosystem of the Earth is-

A. Biosphere

B. Hydrosphere

C. Lithosphere

D. Biome

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194 .The product of conductivity and resistivity of a conductor

A. Depends on pressure applied

B. Depends on current flowing through conductor

C. is the same for all conductors

D. Varies from conductor to conductor

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195 .In an isothermal expansion of a gas

A. a pressure remains constan

B. temperature remains constant

C. density remains constant

D. None of these

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