Questions

Q:

A copper wire of radius r and length lhas a resistance of R. A second copper wire with radius 2r and length lis taken and the two wires  are  joined  in  a  parallel  combination. The  resultant  resistance   of  the  parallel combination of the two wires will be

A) 5 R B) 5 R/4
C) 4 R/5 D) R/5
 
Answer & Explanation Answer: D) R/5

Explanation:

1st copper wire: R = pl/A = pl/ πr2

2ndcopper wire: R’ = p’l’/A’ = pl/(4 πr2) = R/4

If joined in parallel, (1/Req) = (1/R) + (1/R’)

= 1/R + 4/R1/Req= 5/R

Req= R/5

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Filed Under: Physics
Exam Prep: Bank Exams

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Q:

At what temperature do pathogenic bacteria grow best in food?

A) 5 to 15 degrees Celsius B) 15 to 25 degrees Celsius
C) 20 to 45 degrees Celsius D) 40 to 65 degrees Celsius
 
Answer & Explanation Answer: C) 20 to 45 degrees Celsius

Explanation:

The Bacteria that causes Food Borne illness are called Food Borne Pathogens. Most of the pathogens are mesophilic in nature, optimum temperature may be around 20-45 degree celsius. This range of temperatures is often called the "Danger Zone." Dry foods do not support the growth of bacteria.

 

In order to kill pathogenic bacteria you need temperatures above 74ºC. Temperature is the easiest factor to control in order to prevent bacterial growth.

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Filed Under: Biology
Exam Prep: Bank Exams , AIEEE
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6 2820
Q:

Which of these is Not a Carcinogen?

A) Cadmium B) Asbestos
C) Benzene D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

Asbestos can cause

    •  Lungs
    • Gastrointestinal tract  types of Cancer.

Benzene can cause

    • Leukemia
    • Hodgkin's lymphoma types of Cancer.

Cadmium can cause

    • Prostate type of Cancer.
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Filed Under: Biology
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7 2820
Q:

Cholesterol belongs to which class of molecules?

A) Lipids B) Carbohydrates
C) Nucleic acids D) Proteins
 
Answer & Explanation Answer: A) Lipids

Explanation:

Cholesterol belongs to lipids class of molecules. Lipids are sometimes called as fats which act as storing energy and structural components of cell membranes.

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Filed Under: Biology
Exam Prep: AIEEE , Bank Exams
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5 2820
Q:

Titan industries has rolled out its own Swiss made premium watches in India under the brand Name of 

A) Insignia B) Xylys
C) Bvlgeri D) Titan Sens
 
Answer & Explanation Answer: B) Xylys

Explanation:
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Filed Under: Business Awareness

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Q:

Which animal exclusively eat only eucalyptus leaves and nothing else?

A) Koala B) Arctic tern
C) Catfish D) Tropical cockroach
 
Answer & Explanation Answer: A) Koala

Explanation:

Koala is a animal that exclusively eat only eucalyptus leaves and nothing else.

Which_animal_exclusively_eat_only_eucalyptus_leaves_and_nothing_else1537791367.jpg image

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Filed Under: Animals and Birds
Exam Prep: AIEEE , Bank Exams , CAT , GATE
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3 2818
Q:

The Solar System was discoverd by

A) Galleleo B) Finsen
C) Copernicus D) None of these
 
Answer & Explanation Answer: C) Copernicus

Explanation:
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Filed Under: Inventions

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Q:

The Survey of India was established in

A) 1851 B) 1767
C) 1857 D) 1771
 
Answer & Explanation Answer: B) 1767

Explanation:

The National Survey and Mapping Organization of the country under the Department of Science & Technology is The Survey of India. It was founded by The East India Company in the year 1767, head quartered in Dehradun.

 

 The_Survey_of_India_was_established_in1552044109.jpg image

 

The East India Company appointed James Rennell to survey the Bengal Presidency in 1767.

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Filed Under: Indian Geography
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