Questions

Q:

What are the different job scheduling in operating systems?

Answer

Scheduling is the activity of the deciding when process will receive the resources they request.


FCS ---> FCSFS stands for First Come First Served. In FCFS the job that has been waiting the longest is served next.


Round Robin Scheduling--->Round Robin scheduling is a scheduling method where each process gets a small quantity of time to run and then it is preempted and the next process gets to run. This is called time-sharing and gives the effect of all the processes running at the same time


Shortest Job First ---> The Shortest job First scheduling algorithm is a nonpreemptive scheduling algorithm that chooses the job that will execute the shortest amount of time.


Priority Scheduling--->Priority scheduling is a scheduling method where at all times the highest priority process is assigned the resource.

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Q:

Which one of the following is a plant hormone?

A) Cytokinin B) Oestrogen
C) Thyroxin D) Insulin
 
Answer & Explanation Answer: A) Cytokinin

Explanation:

Cytokinins is a Plant hormone which helps in cell division and leads to Growth & formation of shoots, roots & bud.

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Q:

Deficiency of which minerals causes goiter?

A) Magnesium B) Calcium
C) Iodine D) Sulphur
 
Answer & Explanation Answer: C) Iodine

Explanation:

Deficiency of Iodine cause Goiter also called Enlarged Thyroid. It doesn't give any pain but difficult to swallow and breath are its causes.

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Q:

Which of the following equals one atomic mass unit?

A) one-twelfth the mass of one carbon-12 atom B) the mass of one electron
C) one-sixth the mass of one helium-4 atom D) the mass of one carbon-12 atom
 
Answer & Explanation Answer: A) one-twelfth the mass of one carbon-12 atom

Explanation:

One atomic mass unit (AMU) is equal to the one-twelfth the mass of one carbon-12 atom.

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Q:

Which gas is a source of natural groundwater pollution?

A) Helium B) Krypton
C) Radon D) Argon
 
Answer & Explanation Answer: C) Radon

Explanation:

Radon gas is a source of natural groundwater pollution.

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Q:

The ratio of volume of a cone to that of a cylinder if cylinder radius is reduced by 4 times and its height increased by 8 times of that of the cone, is - 

A) 3:2 B) 2:3
C) 5:7 D) 7:5
 
Answer & Explanation Answer: B) 2:3

Explanation:

Ans. Let radius of the base and height of the cone be ‘r’ & ‘h’ respectively.

Then volume of cone = πr2h/3 For cylinder, radius is reduced by 4 times = r/4 And,  height is increased by 8 folds = 8h Volume of cylinder = πR2H = π(r/4)2 (8h) = (16/8)πr2h = πr2h/2 Ratio of volume of cone to volume of cylinder = (πr2h/3) : (πr2h/2) Or, Ratio = 2 : 3.

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Q:

Where is the headquaters of the Universal postal Union

A) Switzerland B) UK
C) Iran D) India
 
Answer & Explanation Answer: A) Switzerland

Explanation:
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Q:

Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.

The Alaska pipeline starts at the frozen edge of the Arctic Ocean. It stretches southward across the largest and northernmost state in the United States, ending at a remote ice-free seaport village nearly 800 miles from where it begins. It is massive in size and extremely complicated to operate. The steel pipe crosses windswept plains and endless miles of delicate tundra that tops the frozen ground. It weaves through crooked canyons, climbs sheer mountains, plunges over rocky crags, makes its way through thick forests, and passes over or under hundreds of rivers and streams. The pipe is 4 feet in diameter, and up to 2 million barrels (or 84 million gallons) of crude oil can be pumped through it daily. Resting on H-shaped steel racks called "bents", long sections of the pipeline follow a zigzag course high above the frozen earth. Other long sections drop out of sight beneath spongy or rocky ground and return to the surface later on. The pattern of the pipeline's up-and-down route is determined by the often harsh demands of the arctic and subarctic climate, the tortuous lay of the land, and the varied compositions of soil, rock, or permafrost (permanently frozen ground). A little more than half of the pipeline is elevated above the ground. The remainder is buried anywhere from 3 to 12 feet, depending largely upon the type of terrain and the properties of the soil. One of the largest in the world, the pipeline cost approximately $8 billion and is by far the biggest and most expensive construction project ever undertaken by private industry. In fact, no single business could raise that much money, so 8 major oil companies formed a consortium in order to share the costs. Each company controlled oil rights to particular shares of land in the oil fields and paid into the pipeline-construction fund according to the size of its holdings. Today, despite enormous problems of climate, supply shortage, equipment breakdowns, labour disagreements, treacherous terrain, a certain amount of mismanagement, and even theft, the Alaska pipeline has been completed and is operating.


What is the capacity of the Alaskan pipeline?

A) 2 million gallons of crude oil B) 4 million barrels of crude oil
C) 84 million gallons of crude oil D) 84 billion barrels of crude oil
 
Answer & Explanation Answer: C) 84 million gallons of crude oil

Explanation:
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