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Q:

‘Plum  Pudding  Model’  for  an  atom  was proposed by

A) Antoine Lavoisier B) Robert Boyle
C) Ernest Rutherford D) J. J. Thomson

Answer:   D) J. J. Thomson



Explanation:

The   first   model   of   atom   was proposed   by   J.   J.   Thomson   in 1898.According  to  this  model,  the positive   charge   of   the   atom   is uniformly   distributed   throughout the  volume  of  the  atom  and  the negatively  charged  electrons  are embedded  in  it  like  seeds  in  a watermelon.    This    model    was picturesquely  called  plum  pudding model of the atom

Subject: Chemistry
Exam Prep: Bank Exams
Q:

The percentage of nitrogen in the air is about

A) 74% B) 76%
C) 78% D) 80%
 
Answer & Explanation Answer: C) 78%

Explanation:
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9 883
Q:

Methane contributes towards global warming so it is called a _________________ gas.

 

A) poisonous B) carcinogenic
C) infectious D) greenhouse
 
Answer & Explanation Answer: D) greenhouse

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2 31178
Q:

Which of the following is a metal?

 

A) Sulphur B) Nitrogen
C) Oxygen D) No option is correct
 
Answer & Explanation Answer: D) No option is correct

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1 10198
Q:

Which of the following group is NOT Dobereiner Triads?

 

A) Li, Na, K B) N, P Au
C) Cl, Br, I D) Ca, Sr, Ba
 
Answer & Explanation Answer: B) N, P Au

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3 47588
Q:

Safety matches contain

A) Sulphur B) Phosphorus
C) Magnesium D) Potassium
 
Answer & Explanation Answer: B) Phosphorus

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Exam Prep: AIEEE , Bank Exams

3 851
Q:

Air ___________________ are the substances which contaminate the air.

A) Reactants B) Irritants
C) Resistants D) Pollutants
 
Answer & Explanation Answer: D) Pollutants

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2 811
Q:

By using which foam the Researchers from Indian Institute of Technology – Bombay have made a low cost piezo resistive vibration sensor?

A) Only Polyurethane B) Only Polyethylene
C) Both Polyurethane and Polyethylene D) Neither Poly urethane nor Polyethylene
 
Answer & Explanation Answer: B) Only Polyethylene

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5 871
Q:

Which of the following is NOT a compound?

 

A) Ammonia B) Milk
C) Sodiumchloride D) Chalk
 
Answer & Explanation Answer: B) Milk

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9 20315