SSC CGL PHYSICS Question Answer Part - 4 (Q. No. 151-200)
151. Which of the following property of sound is affected by change in air temperatue?
(a) Wavelength
(b) Amplitude
(c) Frequency
(d) Intensity
152. The intensity ratio of waves is 25:9. What is the ratio of their amplitudes?
(a) 5 : 3
(b) 25 : 9
(c) 3 : 5
(d) 50 : 18
153. The velocity of sound in moist is more than in dry air because the moist air has
(a) more density than dry has
(b) less density than dry air
(c) more pressure than dry air
(d) less pressure than dry air
154. If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
(a) 4 : 1
(b) 1 : 16
(c) 2 : 1
(d) 1 : 4
155. Velocity of light is maximum is
(a) Diamond
(b) water
(c) glass
(d) vaccum
156. A number of images of a candle flame are seen in thick mirror
(a) the first image is the brightest
(b) the second image is the brightest
(c) the last image is the brightest
(d) all images are equally brightest
157. The image of our face in a plane mirror
(a) real
(b) magnified
(c) diminished
(d) none of these
158. Mirage is observed in a desert due to the phenomenon of
(a) interference
(b) total reflection
(c) scattering
(d) double refraction
159. Crirical angle of light passing from glass to water is minimum for
(a) interference
(b) total reflection
(c) scattering
(d) double refraction
160. To an observer on thearth the stars appear to twinkle. This can be described to
(a) the fact that starts do not emit light continuously own atmosphere
(b) frequent absorption of star light by earth’s atmosphere
(c) frequent absorption of star light by their own atmosphere
(d) the refractive index fluctuations in earth’s atmosphere
161. For an astronaut in a space ship, the sky appears
(a) black
(b) white
(c) green
(d) blue
162. If there were no atmosphere, the length of the day on the earth will
(a) decrease
(b) increase
(c) remain the same
(d) none of these
163. Myopia is due to
(a) shortening of eye ball
(b) irregular changes in the focal length of the eye lens
(c) older age
(d) elongation of eye ball
164. Astigmatism for a human eye can be removed by using
(a) concave lens
(b) convex lens
(c) cylindrical lens
(d) prismatic lens
165. The phenomenon which cause mirage is:
(a) Interfefrence
(b) Diffraction
(c) Polarisaiton
(d) Total internal refelection
166. Which one of the following phenomena is used in optical fibres?
(a) Scattering
(b) successive reflections
(c) Refraction
(d) total internal reflection
167. Which of the following is used by dentis to see the image of teech of a patient?
(a) Cancave lense
(b) Convex lense
(c) Convex mirror
(d) Plane mirror
(e) None of these
168. Rainbows are produced when sunlight.
(a) Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection
(b) None of the given statements is correct
(c) Incident on raindrops hanging in the atmosphere is dispersed after suffering reflection
(d) Incident on rain drops hanging in the atmoshpher is is dispersed after suffering refraction
169. The nature of sun’s spectrum is
(a) Continuous spectrum with absorption lines
(b) Line emission
(c) The spectrum of the Helium atom
(d) Continuous spectrum
170. Which of the following is not caused by atmospheric refraction of light?
(a) Sun appearing higher in the sky than it actually is
(b) Sun becoming visible two or three minutes before actual sunrise
(c) Sun appearing red at sunset
(d) Twinkling of stars at night
171. Blue colour of the sky is consequence of
(a) reflection
(b) refraction
(c) scattering
(d) dispersion
172. Colours of thin films are due to
(a) dispersion of light
(b) interference of light
(c) absorption of light
(d) scattering of light
173. When viewed in white light, soap bubles show colours because of
(a) interference
(b) scattering
(c) diffraction
(d) dispersion
174. The phenomenon of interference is shown by
(a) Longitudinal mechanical wave’s only
(b) Transverse mechanical wave’s only
(c) Non- mechanical transverse waves only
(d) All the above types of wave
175. Laser light is considered to be coherent because it consists of
(a) many wavelengths
(b) Uncoordinated wavelengths
(c) Coordinated waves of exactly the same wave length
(d) Divergent beams
176. In the human eye, the focussin is done by
(a) to and fro movement of the eye lens
(b) to and from movement of the retine
(c) chang in the convexity of the eye lens
(d) Change in the refractive index of the eye fluids.
177. The image formed on the retine of a human eye is
(a) virtual and inverted
(b) virtual and erect
(c) real and erect
(d) real and inverted
178. 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
179. Different objects at different distances are seen by the eye. The paramenter athe remains. Constent is
(a) the focal length of the eye lens
(b) the object distance from the eye lens
(c) the radii of curvature of the eye lens
(d) the image distance from the eye lens
180. The mercury and sodium street lamps light up because of.
(a) Electron absorption
(b) Electron emission
(c) Atomic emission
(d) Atomic absorption
181. Why is red light employed for danger signals?
(a) red colour is sooting to the eye
(b) human eye is most sensitive to red colour
(c) red light is scattered least
(d) red light is scattered most
182. A ray of white light strikes the surface of an object. If all the colours are reflected the surface would appear:
(a) Black
(b) White
(c) Grey
(d) Opaque
183. In optical instrument, the lenses are used to form image by the phenomenon of –
(a) reflection
(b) refraction
(c) scattering
(d) diffusion
184. A water tank appears shallower when it is viewed from top due to
(a) Rectilinear propagation of light
(b) Reflection
(c) Total internal reflection
(d) Refraction
185. The primary colours in phothgraphy are
(a) red, blue, yellow
(b) red, yellow, green
(c) red, blue, green
(d) red, green, cyan
186. The head mirror used by E.N.T. doctors is
(a) Cancave
(b) convesx
(c) plane
(d) planoconvex
187. Radar is used to
(a) locate submerged submarines
(b) receive signal from radio receivers
(c) detect and locate distant objects
(d) locate geostationary satellites
188. The colours of starts depends on their
(a) temperature
(b) distance
(c) radius
(d) atmospheric pressure
189. Rainbow is formed due to
(a) refraction and dispersin
(b) scattering and refraction
(c) diffreaction and refraction
(d) refraction and reflection
190. Light from the sun reaches upon in nearly
(a) 8 min.
(b) 2 min.
(c) 6 min.
(d) 4 min.
191. Total internal reflection cannot take place when light goes from:
(a) water to glass
(b) water to air
(c) glass to air
(d) glass to water
192. A ray of light when refracted suffers change in velocity. In theis context, which one among the following statements is correct?
(a) Velocity increases as the ray passes from a rarer to a denser medium
(b) Velocity decreases as the ray passes from a denser to a rarer medium
(c) Velocity decreases as the ray passes from a rarer to a denser medium
(d) Change of velocity does not depend on the nature of medium
193. The colour of stars depends upon their
(a) Temperature
(b) Pressure
(c) Age
(d) Distance from Solar System
194. Which famous scientist was the first to look at the night sky throught a telescope?
(a) Comernicus
(b) Newton
(c) Michael Faraday
(d) Galileo
195. A plane glass slab is kept over coloured letters, the letter which appears least raised is
(a) Green
(b) Violet
(c) Red
(d) Blue
196. A plant with green leaves placed in red light will appear
(a) Green
(b) Violet
(c) Red
(d) Blue
197. A soap buble is given negative charge then its radius
(a) decreases
(b) increases
(c) remains unchanged
(d) none of these
198. 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
199. A galvanometer is converted into an ammeter when we connect a
(a) high resistance in series
(b) high resistance in parallel
(c) low resistance in series
(d) low resistance in parallel
200. A galvanometer is converted into a voltmeter when we connect a
(a) high resistance in series
(b) high resistance in parallel
(c) low resistance in parallel
(d) low resistance in series
Answer Key
