UKPCS Science: Human Eye(2) #27

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science (paper #6).

Working of the Eye

The light rays coming from the object enter the eyes through pupil and falls on eye lens. The eye lens then converge the light rays and produce an image of the object on retina which is real and inverted. Retina has large number of light sensitive cells which can generate electrical signals. After the image is formed on the retina it sends electrical signals to the brain and we have a sensation of image. Also, even though the image formed on retina is inverted out mind interprets it as erect.

So, eye lens is the convex lens and retina is the screen of the eye. Continue reading “UKPCS Science: Human Eye(2) #27”

Target UPSC prelims 2019: Daily MCQs #17

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs.

1. Consider the following statements with respect to Bru refugees in India:
1. Large groups of Bru tribes migrated to Tripura after an ethnic clash at
Bangladesh in 1997.
2. Bru refugees are not entitled to vote anywhere in India.
Which of the statement(s) given above is/are
correct?
a. 1 only
b. 2 only
c. Both 1 and 2
d. Neither 1 nor 2
Continue reading “Target UPSC prelims 2019: Daily MCQs #17”

UKPCS Science: Electrical safety #25

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science (paper #6).

Electricity can be hazardous. Insulation, earthing, fuses and circuit breakers help to protect us from electrical injury. Electrical energy is current multiplied by voltage and time.

  • Insulators are used in electrical equipment to support and separate electrical conductors without allowing current through themselves. Glass, plastic, rubber, air, and wood are used as insulator. They form part of covering of copper wire and restrict the appliance from becoming live.
  • Earthing: It is a part of electrical circuit which is done on initial level in order to connect the electrical system with mass of earth so as to have discharge the electrical energy.

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Target UPSC prelims 2019: Daily MCQs #15

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs. 

1. Consider the following statements about Chandrayaan- I:
1. It is an indigenous mission of India comprising an Orbiter, Lander and Rover.
2. It was the first to gather a definitive evidence of water in moon.
Which of the statement(s) is/ are true?
a. 1 only
b. 2 only
c. Both 1 and 2
d. Neither 1 nor 2
Continue reading “Target UPSC prelims 2019: Daily MCQs #15”

Target UPSC prelims 2019: Daily MCQs #13

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs. 

1. Consider the following statements about LIGO:
1. It is the world’s largest Gravitational wave observatory that works by merging two or more sources of light to create an interference
pattern.
2. Unlike Electromagnetic waves, Gravitational waves do not interact with matter at all.
Which of the statement(s) is/ are true?
a. 1 only
b. 2 only
c. Both 1 and 2
d. Neither 1 nor 2
Continue reading “Target UPSC prelims 2019: Daily MCQs #13”

UKPCS Science: Transformer#23

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science (paper #6).

A transformer is an electrical device that takes electricity of one voltage and changes it into another voltage. A distribution transformer or service transformer is a transformer that provides the final voltage transformation in the electric power distribution system, stepping down the voltage used in the distribution lines to the level used by the customer.

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UKPCS Science: Electric generator (dynamo)#22

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science (paper #6).

Electric generator (dynamo): In electricity generation, a generator is a device that converts mechanical energy to electrical energy. Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines and even hand cranks.

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UKPCS Science: RADIOACTIVITY#16

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science (paper #6).

Sometimes the nucleus of an atom is unstable. A change will occur in the nucleus to make it more stable. The change is called a decay. When a nucleus decays it will emit (give out) some particles or waves. Emitting particles or waves from the nucleus is called radioactivity.

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Target UPSC prelims 2019: Daily MCQs #4

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs. 

1. Consider the following statements about ‘Advance Air Defence’.
1. It is a supersonic ballistic interceptor missile developed by the Ordnance Factory Board of Kolkata.
2. The AAD is capable to perform interception operation of multiple missiles simultaneously.
Which of the above statement(s) is/ are true?
a. 1 only
b. 2 only
c. Both 1 and 2
d. Neither 1 nor 2
Continue reading “Target UPSC prelims 2019: Daily MCQs #4”

UKPCS Science: Holography#15

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science (paper #6).

Holography is a photographic technique that records the light scattered from an object, and then presents it in a way that appears three-dimensional. Holograms pop up in movies such as “Star Wars” and “Iron Man”. It was also used in 2014 Lok Sabha elections.

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