SSC CGL -Science Questions 4 September 2016

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Q1.Green House Effect' means

1) Pollution in houses in tropical region
2) Prevention of ultra-violet radiation by the ozone layer
3) Trapping of solar energy due to atmospheric gases
4) Damage to green painted buildings

Explanation -

The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere.

Earth’s natural greenhouse effect is critical to supporting life. Human activities, mainly the burning of fossil fuels and clearing of forests, have strengthened the greenhouse effect and caused global warming.

By their percentage contribution to the greenhouse effect on Earth the four major gases are

·         water vapor, 36–70%

·         carbon dioxide, 9–26%

·         methane, 4–9%

·         ozone, 3–7%

Protocols on global warming

The Kyoto Protocol 

The Kyoto Protocol was adopted in Kyoto, Japan on 11 December 1997 and entered into force on 16 February 2005. 

There are currently 192 parties (Canada withdrew effective December 2012) to the Protocol.

The Kyoto Protocol is an international treaty which extends the 1992 United Nations Framework Convention on Climate Change.

The Kyoto Protocol applies to the six greenhouse gases -

1.Carbon dioxide (CO2), 

2.Methane (CH4), 

3.Nitrous oxide (N2O), 

4.Hydrofluorocarbons (HFCs) 

5.Perfluorocarbons (PFCs) 

6.Sulphur hexafluoride (SF6).

Q.2 Addition of suitable impurities into semiconductor, is called
1) Doping
2) Mixing
3) Forming
4) Diluting

Explanation –

What is Doping ?

Intentionally introducing impurities into an extremely pure semiconductor to change its electrical properties.

Conductors -   a conductor is an object or type of material that allows the flow of an electrical current in one or more directions. Materials made of metal are common electricalconductors.

very low values of resistivity, This low value allows them to easily pass an electrical.

Good examples conductors are generally metals such as Silver ,Copper, Aluminium etc.

Is Carbon conduct electricity because it is Non-Metal?

Ans- Carbon by its own  does not conduct electricity, but its allotrope graphite conducts electricity . This is because graphite has a “free” electron in its outer shell that allows it to conductsome electricity. 

Semiconductor Basics

They have electrical properties somewhere in the middle, between those of a “conductor” and an “insulator”. 

They are not good conductors nor good insulators (hence their name “semi”-conductors). They have very few “free electrons” because their atoms are closely grouped together in a crystalline pattern called a “crystal lattice” but electrons are still able to flow, but only under special conditions.

Examples - silicon (Si), germanium (Ge) and gallium arsenide (GaAs).

Silicon and Germanium are classed as intrinsic semiconductors, that is they are chemically pure, as the doped silicon is no longer pure.

Note-  Silicon is most commonly used semiconductor, it has four valence electrons in its outermost shell.

Insulators

They are the exact opposite of conductors.

3.Kyoto Protocol is associated with
1) Species conservation
2) Climate change
3) Wetland Conservation
4) Medicinal plants

4.Meibomian glands are located in


1) Eye
2) Ear
3) Nose
4) Skin 

Explanation –

The Meibomian glands (often written with a small m, and also called tarsal glands) are a holocrine type of exocrine glands, at the rim of the eyelids inside the tarsal plate, responsible for the supply of meibum, an oily substance that prevents evaporation of the eye's tear film. Meibum prevents tear spillage onto the cheek, trapping tears between the oiled edge and the eyeball, and makes the closed lids airtight.

Brunner's glands (or duodenal glands).

The main function of these glands is to produce a mucus-rich alkaline secretion (containing bicarbonate) in order to:

·         protect the duodenum from the acidic content of chyme (which is introduced into the duodenum from the stomach)

·         provide an alkaline condition for the intestinal enzymes to be active, thus enabling absorption to take place

·         lubricate the intestinal walls

Sebaceous glands 

Sebaceous glands are microscopic exocrine glands in the skin that secrete an oily or waxy matter, called sebum.

In humans, they occur in the greatest number on the face and scalp, but also on all parts of the skin except the palms of the hands and soles of the feet.

Sebum, secreted by the sebaceous gland in humans, is primarily composed of triglycerides (≈41%), wax esters (≈26%), squalene (≈12%), and free fatty acids (≈16%).

5.Arsenic problem in India is primarily due to

1) Overexploitation of coal in Bihar and Bengal
2) Overexploitation of arsenopyrite in the hinterland
3) Overexploitation of ground water in the affected areas
4) Overexploitation of surface water in the affected areas

Arsenic contamination in groundwater in the Ganga- Brahmaputra fluvial plains in India and Padma-Meghna fluvial plains in Bangladesh and its consequences to the human health have been reported as one of the world’s biggest natural groundwater calamities to the mankind. In India, seven states namely- West Bengal, Jharkhand, Bihar, Uttar Pradesh in the flood plain of the Ganga River; Assam and Manipur in the flood plain of the Brahamaputra and Imphal rivers and Rajnandgaon village in Chhattisgarh state have so far been reported affected by Arsenic contamination in groundwater above the permissible limit of 10 µg/L.

6.Which of the following vitamins are water soluble?

1) Vit. A & Vit. B
2) Vit. B & Vit. C
3) Vit. C & Vit. D
4) Vit. A & Vit. K

The two different types of vitamins are fat-soluble vitamins and water-soluble vitamins. Fat-soluble vitamins — vitamins A, D, E and K — dissolve in fat before they are absorbed in the bloodstream to carry out their functions. Excesses of these vitamins are stored in the liver, and are not needed every day in the diet

7.Besides CO2, the other green house gas is

Options:

1) CH4
2) N2
3) Ar
4) O2

SSC CGL -Science Questions September 2016"

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1.A galvanometer can be converted to a voltmeter by connecting
1) a high resistance in parallel
2) a high resistance in series
3) a low resistance in series
4) a low resistance in parallel

2.Bee sting contains________________
1) An acidic liquid
2) a salt solution
3) an alkaline liquid
4) a corrosive liquid

In particular, bee stings are acidic, whereas wasp stings are alkaline, so the body's reaction to a bee sting may be very different than to that of a wasp sting.

What is wasp?

3.The outer most layer of Sun is known as___________
1) Chromosphere
2) Photosphere
3) Radioactive zone
4) Corona


4.Highest percentage of carbon is found in which form of coal?
1) Anthracite
2) Bituminous
3) Peat
4) lignite

5.The xylem in plants are responsible for:
1) transport of water
2) transport of food
3) transport of amino acids
4) transport of oxygen

6.Which of the following bacterium causes crown gall disease in plants?
1) Bacillus thurigiensis
2) Agrobacterium tumefaciens
3) Pseudomonas fluorescens
4) None of these

• Crown gall, plant disease, caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter).

 They include especially grape, members of the rose family (Rosaceae), shade and nut trees, many shrubs and vines, and perennialgarden plants. 

Symptoms include roundish rough-surfaced galls (woody tumourlike growths), several centimetres or more in diameter, usually at or near the soil line, on a graft site or bud union, or on roots and lower stems.

7.Eustachian Tube is located in which part of human body?
1) Nose
2) Ear
3) Eyes
4) Throat

The eustachian tube is a canal that connects the middle ear to the nasopharynx,

 which consists of the upper throat and the back of the nasal cavity. It controls the pressure within the middle ear, making it equal with the air pressure outside the body.

8.Which part of the brain plays an important role in motor control?
1) Cerebellum
2) Cerebrum
3) Medulla
4) Pons
  

The cerebellum is a region of the brain that plays an important role in motor control. It may also be involved in some cognitive functions such as attention and language, and in regulating fear and pleasure responses, but its movement-related functions are the most solidly established.

9.The frequency of direct current is _____________
1) Zero
2) 50 HZ
3) 60 HZ
4) 100 HZ

AC is an alternating, always changing current source. This means that the direction of the flow of current goes in both directions within the wire, not at the same time, at some frequency, like 60 Hz. DC is zero Hertz. So by said definition, it is what it is. Steady State DC has no frequency.

10.'Agronomy' is the practice of raising ______________
1) Plants and Animals
2) Crop plants
3) Agriculture
4) Fruit plants only

Agronomy is a branch of agricultural science that deals with the study of crops and the soils in which they grow. Agronomists work to develop methods that will improve the use of soil and increase the production of food and fiber crops.

SSC -Science & GS Questions 3 September 2016"

1. 0°K is equivalent to 1) 273°C
2) -273°C
3) 0°C
4) 100°C

2.The oxygen liberated during photosynthesis comes from
1) Water
2) Carbon dioxide
3) Glucose
4) Chlorophyll

3.The term 'Higgs Boson' is associated with
1) Nano Technology
2) Oncology
3) God Particle
4) Stem Cell Research

4.The component used for tuning a radio is basically a variable ____________________.
1) Resistor
2) Condenser
3) Inductor
4) Transformer


5.Which of the following is not a donor atom? 1) Phosphorus
2) Antimony
3) Arsenic
4) Aluminium

 6.The Beaufort scale is used to measure: 1) Atmospheric pressure
2) Altitudes of mountains
3) Wind velocity
4) Intensity of earthquakes

7. The waste management technique that involves the use of micro-organisms to remove or neutralize pollutants from contaminated site is called
1) Bio sensor
2) Bio magnification
3) Bio remediation
4) Bio concentration

8.In IT networking, which of the following device is used in physical layer?
1) Repeater
2) Router
3) Transport Gateway
4) Bridge

9.The purest form of water in nature is
1) Rain water
2) Lake water
3) River water
4) Sea water

10.The source of energy that causes the least global warming is
1) coal
2) Geothermal energy
3) Natural Gas
4) Petroleum

11.The constellation 'Sapta Rishi' is known to Westerners as the 
1) Seven Monks
2) Alpha Centauri
3) Big Dipper
4) Small Bear

12.MUDRA Bank has been launched to help
1) Small business
2) Marginal farmers
3) Poor women
4) Rural sector

13.Which of the following controls the insurance business of India?
1) RBI
2) IDBI
3) SEBI
4) IRDA

The Speaker of Lok Sabha addresses his letter of resignation to the 
1) President of India
2) Prime Minister
3) Deputy Speaker of Lok Sabha
4) The Chief Justice of India

14.Who presided over the first session of the Indian National Congress?
1) A.O. Hume
2) Surendranath Banerjee
3) W.C. Banerjee
4) Badruddin Tayyabji

15. Which of the following writers has called Akbar's Din-i-Ilahi as a monument of his folly, not of wisdom?
1) Badayuni
2) Vincent Smith
3) Barni
4) W.Haig

16. Question 31.Which of the following region in India is now regarded as an "Ecological Hot Spot"?
1) Western Himalayas
2) Eastern Himalayas
3) Western Ghats
4) Eastern Ghats

17.Bridge is the technique used in
1) Athletics
2) Wrestling
3) Weight lifting
4) Karate

18.Which of the following books is called the 'Bible of Socialism'?
1) Economics of Welfare
2) Das Capital
3) Value and Capital
4) Asian Drama

19.Which country recently detonated its first hydrogen bomb?
1) North Korea
2) South Korea
3) Iran
4) Libya

20.The Swarna Jayanti Shahari Rojgar Yojna (SJSRY) mainly aims at creating employment opportunities for 
1) both self employment and wage employment in urban areas
2) self employment in urban areas only
3) wage employment in urban areas only
4) None of these

21.Who is known as the 'Father of Green Revolution' in India?
1) G. Paul
2) Norman Borlaug
3) Van Neil
4) Dr. Mithchell


22.Which one of the following party was founded by Subhash Chandra Bose?
1) Abhinav Bharat
2) Azad Hind Sena
3) Revolutionary Army
4) Forward Block

23.First national park of India that was established in 1936 was named as
1) Kanha National Park
2) Bharatpur National Park
3) Hailey National Park
4) Rajaji National Park

24.Who is the 1st Indian female amputee to climb Mount Everest?
1) Arunima Sinha
2) Bachendri Pal
3) Santosh Yadav
4) Premlata Agarwal

SSC -Science 2 September 2016" Set 1

1.    During which of the following operating conditions of an automobile, carbon monoxide content in exhaust gas is maximum?


1) Acceleration
2) Cruising
3) Idle running
4) Deacceleration

2.    A galvanometer can be converted into a voltmeter by connecting with it a 
1) high resistance in parallel
2) low resistance on parallel
3) high resistance on series
4) low resistance in series

    

Exp- A galvanometer is a kind of antique instrument designed to measure weak currents. ... Galavnometer is the device which gives response on electric current where voltmeter gives response to potential difference.the galvanometer is the device used for detecting the presence of small current and voltage or for measuring their magnitude.

    

3.    .Even after sunset, the air near the Earth's surface continue to receive heat due to
1) Insolation
2) Terrestrial Radiation
3) Conduction
4) Convection

4.    The largest artery in human body is
1) Aorta
2) Capillary
3) Vena cava
4) Pulmonary vein

5.An eudiometer measures

1) Atmospheric pressure
2) Time
3) Volume of gases
4) Vapour pressure

6 .Trinitrotoluene is

1) used to melt metals
2) used to fuse two metals
3) used as an abrasive
4) used as an explosive

7.One of the leading producers of asbestos in the world is
1) Australia
2) Russia
3) Canada
4) Armenia

8.Nitrification is the biological process of converting


1) N2 into nitrate
2) N2 into nitrite
3) Ammonia into nitrite
4) Ammonia into N2

Oxidation of ammonia to nitrate. Nitrification in nature is a two-step oxidation process of ammonium(NH₄⁺) or ammonia (NH₃) to nitrate (NO₃⁻) catalyzed by two ubiquitous bacterial groups.