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Q:

Chinese spacecraft Chang’e 5 has returned to the Earth, carrying samples from which astronomical body?

 

A) Moon B) Sun
C) Jupiter D) Saturn
 
Answer & Explanation Answer: A) Moon

Explanation:
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Filed Under: General Science
Exam Prep: Bank Exams

Q:

____________________is a measure of the actual amount of water vapour in a particular sample of air: measured as a partial pressure.

A) Specific Humidity B) Absolute Humidity
C) Relative Humidity D) Dew Point
 
Answer & Explanation Answer: B) Absolute Humidity

Explanation:
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Filed Under: Physics
Exam Prep: Bank Exams

Q:

The ratio of milk and water in three samples is 1 : 3, 3 : 5 and 11 : 5. A mixture containing equal quantities of all three samples is made. What will be the ratio of milk and water in the new mixture?

A) 7 : 9 B) 5 : 7
C) 15 : 13 D) 9 : 11
 
Answer & Explanation Answer: A) 7 : 9

Explanation:
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Filed Under: Alligation or Mixture
Exam Prep: Bank Exams

Q:

The pH value of a sample of multiple-distilled water is

A) zero B) 14
C) very near to zero D) very near to seven
 
Answer & Explanation Answer: D) very near to seven

Explanation:

Water  is  neutral  and  has  a  pH value  of  7  and  because  here it  is multiple distilled water, it would be very near to seven

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Filed Under: Chemistry
Exam Prep: Bank Exams

Q:

A sample of matter must be copper if

A) atoms in the sample react with oxygen B) the sample can conduct electricity
C) each atom in the sample has 29 protons D) the sample melts at 1768k
 
Answer & Explanation Answer: C) each atom in the sample has 29 protons

Explanation:

A sample of matter must be copper if each atom in the sample has 29 protons.

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Filed Under: Chemistry
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Q:

Which sample of matter is a mixture?

A) KBr (S) B) NaCl (L)
C) K (S) D) NaCl (Aq)
 
Answer & Explanation Answer: D) NaCl (Aq)

Explanation:

Mixtures are combination of two or more substances physically which can be separated in to the original.

Matter can be breakdown into two categories. 

1) Pure substances 

2) Mixtures

 

Here in the given options, options A, B, C are pure substances as they are indicated as S & L in brackets. Option D) is an aqueous solution, that can be dissolved in water.

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Filed Under: Chemistry
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Q:

Which sample is a pure substance?

A) Table salt B) Pure water
C) a test tube of zinc oxide D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

A pure substance can be defined as any single type of material that has not been contaminated by another substance. In chemistry, a pure substance has a definite composition. It can be a compound or an element. A pure substance is considered to be a material that consists of one type of "building block" of matter.

Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate).

Tin, sulfur, and diamond are examples of pure substances which are chemical elements. All elements are pure substances.

Water, sugar, salt and baking soda are pure substances which are chemical compounds. Chemical compounds also are pure substances

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Filed Under: Chemistry
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Q:

Let K and L be events on the same sample space, with P (K) = 0.8 and P (B) = 0.6. Are these two events are disjoint ?

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

These two events cannot be disjoint because P(K) + P(L) > 1.


P(AꓴB) = P(A) + P(B) - P(AꓵB).


An event is disjoint if P(A ꓵ B) = 0. If K and L are disjoint P(K ꓴ L) = 0.8 + 0.6 = 1.4


And Since probability cannot be greater than 1, these two mentioned events cannot be disjoint.

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Subject: Probability
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Bank Clerk , Bank PO