# Target SSC CGL | 10,000+ Questions | Physics Questions For SSC CGL : Day 13

Dear aspirants,

This is the new year with new goals, new experiences and lots of exams to be scheduled soon. SSC CGL has recently released the exam dates so now it is time to gear up your preparations and try hard to get the success. ADDA247 never fails to deliver something new and fruitful for you all. This time also we are providing you the best study plan as well as a study material. We are here going to prepare your General Science section for the SSC CGL. In this article, we are providing you the details that how we are going to help you to clear the examination this year. We ADDA247 is going to provide you daily tests for all the subjects. The topic-wise quiz will be done from January till April. This will help you to get a deeper knowledge of all the topics and will prepare you thoroughly.

Q1. White light is made up of seven colors. What is the method of separating the colors?
(a) By passing it through a prism
(b) By filtration
(c) Can’t be separated
(d) Both (a) and (b)

Q2. Retina of the eye is comparable to which of the following parts of a traditional camera?
(a) Film
(b) Lens
(c) Shutter
(d) Cover

Q3. The filament of an electric bulb is made of
(a) copper
(b) Aluminum
(d) tungsten

Q4. Which mirror is used as a rear view mirror in the vehicles?
(a) Plane
(b) Convex
(c) Concave
(d) Plano concave

Q5. The reason of mirage is
(a) interference of light
(b) diffraction of light
(c) polarization of light
(d) total internal reflection of light

Q6. To hear a clear echo, the minimum distance should be
(a) 165 feet
(b) 165 meter
(c) 16.5 feet
(d) 16.5 meter

Q7. A cut diamond sparkles because of its
(a) hardness
(b) high refractive index
(c) emission of light by the diamond
(d) absorption of light by the diamond

Q8. Butter paper is an example of …….. object.
(a) a transparent
(b) a translucent
(c) an opaque
(d) a luminous

Q9. A vibrating body
(a) will always produce sound
(b) may or may not produce sound if the amplitude of vibration is low
(c) will produce sound which depends upon frequency
(d) None of these

Q10. The special technique used in ships to calculate the depth of ocean beds is
(a) LASER
(b) SONAR
(c) sonic boom
(d) reverberation

Solutions:-

S1. Ans.(a)
Sol. The speed of light and its components vary inversely with the refractive index of the medium. Refraction is the deviation in the path of light when it travels from one optical medium to the other. Different wavelengths experience different degree of deviation. As a result, white light splits into 7 colours (VIBGYOR) on passing through the prism.

S2. Ans.(a)
Sol. Retina of the eye is comparable to the film of a traditional camera. Retina is a film of nerve fibres. Image of the object is formed at retina just like camera film is used to see the images.

S3. Ans.(d)
Sol. Filament of bulb is made of tungsten because of its high melting point (3422°C), lowest vapour pressure and great tensile strength. Hence, when current passes, it gets heated to emit light but does not melt or expand.

S4. Ans.(b)
Sol. Convex mirror is a diverging mirror used as a rear view mirror in the vehicles as it covers wide range of vehicles coming behind.

S5. Ans.(d)
Sol. Mirage is an optical illusion. The reason of mirage is total internal reflection of light. In summer air near the ground is hotter and hence rarer than the air above which is responsible for TIR, hence, mirage is formed.

S6. Ans.(d)
Sol. ∴ d = 16.5 metre

S7. Ans.(b)
Sol. Diamonds have a very high refractive index (about 2.42 compared to about 1.5 for glass). The amount of light reflected at an air/other material interface is related to the refractive index charge at the interface and the bigger the refractive index change, the more light is reflected. Thus, diamond reflects large amount of light and therefore, sparkles more.

S8. Asn.(b)
Sol. Butter paper is a translucent object as it allows light to pass through it partially, thus not providing clear vision. While, a transparent substance allows light to pass through it completely providing a clear vision. Whereas, an opaque substance is impenetrable to light. On the other hand, luminous objects emit their own light.

S9. Ans.(c)
Sol. A vibrating body will produce sound which is dependent upon the frequency. Sounds of frequencies less than about 20 vibrations per second (20 Hz) cannot be detected by the human ear. Such sounds are called inaudible. On the higher side, sounds of frequencies higher than about 20,000 vibrations per second (20 kHz) are also not audible to the human ear.

S10. Ans.(b)
Sol. SONAR or sound Navigation and Ranging is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves. These also determine the time between the emission of sound pulse and its reception, the transducer can determine the range and orientation of the object.
While, LASER is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. Whereas, sonic boom is the sound associated with the shock waves created by an object travelling through the air faster than the speed of sound. On the other hand, reverberation is the prolongation of a sound.

In the last month i.e. in May daily we will provide you with a test of the previous years’ question papers, this will increase your confidence of solving the real exam and will make you familiar with the real-time exam.

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