Questions

Q:

When an object is thrown vertically upwards, at its maximum height its _____________.

 

A) potential energy is zero B) momentum is maximum
C) kinetic energy is zero D) gravitational force is maximum
 
Answer & Explanation Answer: C) kinetic energy is zero

Explanation:
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Filed Under: Physics
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2 14924
Q:

Which amongst the following states/UTs has Not identified tribal community

A) Chhattisgarh B) Haryana
C) Maharashtra D) Karnataka
 
Answer & Explanation Answer: B) Haryana

Explanation:
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Filed Under: Indian Economy

29 14918
Q:

A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

A) will increase B) will decrease
C) does not change D) varies with the increase of depth of the immersion of the iron piece
 
Answer & Explanation Answer: A) will increase

Explanation:

When the piece of iron is lowered into the water, the water level in the bucket increases. And so the pressure at the bottom of bucket also increases. Thus the total thrust at the botto also increases. Therefore the spring balance reading increases.

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Filed Under: Physics

68 14916
Q:

Which combination of atoms can form a polar covalent bond?

A) H and Br B) H and H
C) Na and Br D) N and N
 
Answer & Explanation Answer: A) H and Br

Explanation:

Only H and Br form Polar Covalent Bond.

 

Covalent bonding:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

1. Polar Covalent Bond

2. Nonpolar Covalent Bond

 

1. Polar Covalent Bond:

A Polar Covalent Bond is created when the shared electrons between atoms are not equally shared. This occurs when one atom has a higher electronegativity than the atom it is sharing with. The atom with the higher electronegativity will have a stronger pull for electrons (Similiar to a Tug-O-War game, whoever is stronger usually wins). As a result, the shared electrons will be closer to the atom with the higher electronegativity, making it unequally shared.

 

2. Nonpolar Covalent Bond:

A Nonpolar Covalent Bond is created when atoms share their electrons equally. This usually occurs when two atoms have similar or the same electron affinity. The closer the values of their electron affinity, the stronger the attraction. This occurs in gas molecules; also known as diatomic elements. Nonpolar covalent bonds have a similar concept as polar covalent bonds; the atom with the higher electronegativity will draw away the electron from the weaker one.

 

Here H and H and N and N form Non-polar covalent bonds. Na and Br form the ionic bond.

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Filed Under: Chemistry
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13 14909
Q:

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

Genetic variation is the cornerstone of evolution, without which there can be no natural selection, and so a low genetic diversity decreases the ability of a species to survive and reproduce, explains lead author Yoshan Moodley, Professor at the Department of Zoology, University of Venda in South Africa.

Two centuries ago, the black rhinoceros – which roamed much of sub Saharan Africa – had 64 different genetic lineages; but today only 20 of these lineages remain, says the paper. The species is now restricted to five countries, South Africa, Namibia, Kenya, Zimbabwe and Tanzania. Genetically unique populations that once existed in Nigeria, Cameroon, Chad, Eritrea, Ethiopia, Somalia, Mozambique, Malawi and Angola have disappeared. The origins of the 'genetic erosion' coincided with colonial rule in Africa and the popularity of big game hunting. From the second half of the 20th century, however, poaching for horns has dramatically depleted their population and genetic diversity, especially in Kenya and Tanzania.


From the second half of the 20th century what has caused a dramatic fall in black rhinoceros population?

A) poaching B) colonial rule
C) big game hunting D) fall in genetic diversity
 
Answer & Explanation Answer: A) poaching

Explanation:
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Filed Under: English
Exam Prep: Bank Exams

0 14907
Q:

Improve the given sentence if necessary.

I wish I can help you.

A) may help B) could have helped
C) could help D) No improvement
 
Answer & Explanation Answer: C) could help

Explanation:

Modal ‘can’ needs to be replaced with ‘could’ to make the sentence grammatically correct.‘Could’ is used to express power and possibility in past tense. Thus, the correct formation would be, ‘I wish I could help you’.

 

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Filed Under: English
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0 14899
Q:

Which of the following pairs is INCORRECT?

I. Haematite : Iron

II. Pitchblende : Copper

III. Monazite : Thorium

A) Only I B) Only II
C) Only I and Only II D) Only I and Only III
 
Answer & Explanation Answer: B) Only II

Explanation:
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Filed Under: Chemistry
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0 14895
Q:

Which of the following is/are the feature(s) of the Brahmadeya Grants during c 600-1200 AD?

1. Their creation meant a renunciation of actual or potential sources of revenue by the State.

2. These grants could vary from a small plot to several villages.

3. Most grants were made in unsettled areas.

Select the correct answer using the code given below.

A) 1 only B) 2 and 3 only
C) 1 and 2 only D) 1, 2 and 3
 
Answer & Explanation Answer: C) 1 and 2 only

Explanation:
The first 2 statements are true with respect to the Brahmadeya Grants during 600-1200 AD.
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Filed Under: Indian History
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0 14888