question_answer 1)
The polarity of an unmarked horse shoe magnet can be determined by using [NDA]
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question_answer 2)
The earth's magnetic field is approximately [NDA]
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question_answer 3)
An electric lamp of 100 watt is used for 10 hours per day. The 'units' of energy consumed in one day by the lamp is [NDA]
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question_answer 4)
The main power supply in India is at 220 V, whereas that in the US is at 110 V. Which one among the following statements in this regard is correct? [NDA]
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question_answer 5)
Two pieces of conductor of same material and of equal length are connected in series with a cell. One of the two pieces has cross-sectional area double that of the other. Which one of the following statements is correct in this regard? [NDA]
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question_answer 6)
Magnetism of a bar magnet can be destroyed if it is [NDA]
I. kept in the magnetic meridian.
II. placed in a direction opposite to that of the Earth's horizontal intensity.
III. heated to a temperature known as Curie temperature.
Select the correct answer using the code given below
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question_answer 7)
What is the order of magnitude of electric resistance of the human body (dry)? [IAS Prelim]
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question_answer 8)
A wire of resistance 16 W is bent in the form of a circle. What is the effective resistance between diametrically opposite points? [NDA]
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question_answer 9)
Fluorescent tubes are fitted with a choke. The choke coil: [IAS Prelim]
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question_answer 10)
Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth? [IAS Prelim]
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question_answer 11)
Match List I with List II and select the correct answer using the code given below the Lists: [NDA]
List I(Magnet)
List II(Property)
A.
Artificial magnet
1.
Long lived
B.
Permanent magnet
2.
Last for infinitely long period
C.
Temporary magnet
3.
Short lived
D.
Earth as a magnet
4.
Induced magnet
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question_answer 12)
Consider the following statements regarding a motor car battery: [IAS Prelim]
1. The voltage is usually 12V. 2. Electrolyte used is hydrochloric acid. 3. Electrodes are lead and copper. 4. Capacity is expressed in ampere-hour.
Which of the above statements are correct?
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question_answer 13)
From a power station, the power is transmitted at a very high voltage because -
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question_answer 14)
What is the number of neutral points for a bar magnet with its north pole pointing geographical north? [NDA]
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question_answer 15)
Magnets attract magnetic substances are iron, nickel, cobalt, etc. They can also repel [NDA]
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question_answer 16)
Which one among the following is the correct order of power consumption for light of equal intensity? [NDA]
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question_answer 17)
Two pieces of metallic wire having equal lengths and equal volume placed in air have different resistances. The two wires must [NDA]
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question_answer 18)
Graphene is frequently in news recently. What is its importance? [IAS Prelim]
1. It is a two-dimensional material and has good electrical conductivity. 2. It is one of the thinnest but strongest materials tested so far. 3. It is entirely made of silicon and has high optical transparency. 4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
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question_answer 19)
If the electrical resistance of a typical substance suddenly drops to zero then the substance is called [NDA]
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question_answer 20)
Which one of the following is correct? Lightning is formed, when [NDA]
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question_answer 21)
Consider the following statements: An ordinary light bulb has a rather short life because the: [IAS Prelim]
1. filament wire is not uniform. 2. bulb cannot be evacuated completely. 3. wires supporting the filament melt at high temperatures.
Which of the above statements are correct?
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question_answer 22)
Consider the following statements regarding a motor car battery: [IAS Prelim]
1. The voltage is usually 12V. 2. Electrolyte used is hydrochloric acid. 3. Electrodes are lead and copper. 4. Capacity is expressed in ampere-hour.
Which of the above statements are correct?
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question_answer 23)
In which one of the following cases Ohm's law is not valid? [NDA]
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question_answer 24)
Which one of the statements given below is not correct? [NDA]
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question_answer 25)
A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as [NDA]
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question_answer 26)
A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of [NDA]
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question_answer 27)
When light waves travel from air to glass, which variables are affected? [NDA]
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question_answer 28)
Consider the following statement: The principle of total internal reflection is applicable to explain the [NDA]
1. Formation of mirage in desert. 2. Formation of image in microscope. 3. Colour of evening sky. 4. Operation of optical fibres.
Which of the statement given above are correct?
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question_answer 29)
When an optician prescribes a - 5D lens, what does it mean? [NDA]
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question_answer 30)
Which one of the following is the correct angle between the incident and reflected rays when a ray of light incident normally on a plane mirror? [NDA]
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question_answer 31)
A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a [NDA]
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question_answer 32)
What is the phenomenon of the moon to appear bigger in size as it approaches the horizon, called? [NDA]
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question_answer 33)
Which one among the following is used to make periscope? [NDA]
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question_answer 34)
What is the essential difference between a terrestrial telescope and an astronomical telescope? [NDA]
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question_answer 35)
A ray of light is incident normally on one of the faces of right angled isosceles prism as shown above. It undergoes total internal reflection from hypotenuse. Which one of the following is the minimum refractive index of the material of the prism? [NDA]
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question_answer 36)
A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens? [NDA]
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question_answer 37)
An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be the nature of the image? [NDA]
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question_answer 38)
The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for [NDA]
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question_answer 39)
In the figure shown above, \[{{L}_{1}}\] and \[{{L}_{2}}\], are two lenses and are kept along the same axis. A parallel beam of light falling on \[{{L}_{1}}\] leaves \[{{L}_{2}}\] as a parallel beam: [NDA]
Consider the following statements.
1. Both \[{{L}_{1}}\] and \[{{L}_{2}}\] can be convex lenses.
2. The distance between the two lenses can be equal to sum of their focal lengths.
Which of the statements given above is/are correct?
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question_answer 40)
Refractive index of an optical medium changes with [NDA]
1. the nature of the medium. 2. the change in the angle of incidence of the ray. 3. colour of the incident ray.
Select the correct answer using the code given below:
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question_answer 41)
Yellow colour light is used as fog light because yellow colour [NDA]
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question_answer 42)
A refracting telescope consists of [NDA]
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question_answer 43)
An object is placed at the focus of a concave mirror. The image will be [NDA]
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question_answer 44)
Consider the following statements [CDS]
1. Clear sky appears blue due to poor scattering of blue wavelength of visible light. 2. Red part of light shows more scattering than blue light in the atmosphere. 3. In the absence of atmosphere, there would be no scattering of light and sky will look black.
Which of the statements given above is/are correct?
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question_answer 45)
Assertion [A]: A myopic person is advised to use concave lens.
Reason [R]: The eye lens of a myopic person focuses the parallel rays coming from distant objects in front of the retina. [NDA]
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question_answer 46)
If the focal length of the biconvex lens is 25 cm, then the power of the lens will be [NDA]
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question_answer 47)
Two thin convex lenses of focal lengths 4 cm and 8 cm are separated by a distance of 4 cm in air. The combination will have the focal length [NDA]
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question_answer 48)
Assertion [A]: Convex mirror is used as a driver mirror.
Reason [R]: Images formed by convex mirror are diminished in size. [NDA]
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question_answer 49)
Match the column -I and Column - II.
Column-I
Column-II
A.
Myopia
P.
Convex lens
B.
Hypermetropia
Q.
Concave lens
C.
Presbyopia
R.
Cylindrical lens
D.
Astigmatism
S.
Bifocal Lens
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question_answer 50)
Assertion [A]: A person stands at a distance of 1m in front of a concave mirror. If the radius of curvature of the mirror is 4m, the image of the person lies at a distance 2m behind the mirror.
Reason [R]: The general mirror equation confirms the location of the image from the mirror and it could be a real image. [NDA]
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In the figure shown above, \[{{L}_{1}}\] and \[{{L}_{2}}\], are two lenses and are kept along the same axis. A parallel beam of light falling on \[{{L}_{1}}\] leaves \[{{L}_{2}}\] as a parallel beam: [NDA]
