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Q:

Positive ions are formed from neutral atoms by loss of

A) neutrons B) protons
C) nuclear charge D) electrons
 
Answer & Explanation Answer: D) electrons

Explanation:
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Filed Under: Chemistry

Q:

The absolute value of charge on electron was determined by

A) J.J.Thomson B) R.A. Millikan
C) Rutherford D) Chadwick
 
Answer & Explanation Answer: B) R.A. Millikan

Explanation:
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Filed Under: Chemistry

Q:

In a 100 m race, A can beat B by 25 m and B can beat C by 4 m. In the same race, A can beat C by:

A) 21 m B) 26 m
C) 28m D) 29m
 
Answer & Explanation Answer: C) 28m

Explanation:

A : B = 100 : 75

 

B : C = 100 : 96.

 

A : C = (A/B*B/C) = (100/75*100/96) = 100/72  =100:72     

 

   A beats C by (100 - 72) m = 28 m.

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Filed Under: Races and Games

Q:

A can run 22.5 m while B runs 25 m. In a kilometre race B beats A by:

A) 100 m B) 75 m
C) 25 m D) 50m
 
Answer & Explanation Answer: A) 100 m

Explanation:

When B runs 25 m, A runs 45/2 m

 

When B runs 1000 m, A runs (45/2*1/25*1000)m = 900 m.

 

B beats A by 100 m.

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Filed Under: Races and Games

Q:

In a 200 metres race A beats B by 35 m or 7 seconds. A's time over the course is:

A) 40 sec B) 47sec
C) 33sec D) none of these
 
Answer & Explanation Answer: C) 33sec

Explanation:

B runs 35 m in 7 sec.

 

 B covers 200 m in (7/35*200) = 40 sec.

 

B's time over the course = 40 sec.

 

 A's time over the course (40 - 7) sec = 33 sec.

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Filed Under: Races and Games

Q:

In 100 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:

A) 20m B) 25m
C) 22.5m D) 9m
 
Answer & Explanation Answer: A) 20m

Explanation:

Distance covered by B in 9 sec. = (100/45)*9m = 20m

 

 A beats B by 20 metres.

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Filed Under: Races and Games

Q:

In a race of 200 m, A can beat B by 31 m and C by 18 m. In a race of 350 m, C will beat B by:

A) 22.75 m B) 25 m
C) 19.5 m D) 18.5 m
 
Answer & Explanation Answer: B) 25 m

Explanation:

A : B = 200 : 169.

 

 

 

A : C = 200 : 182.

 

 

 

C/B = (C/A*A/B) = (182/200*200/169) = 182:169

 

 

 

When C covers 182 m, B covers 169 m.

 

 

 

When C covers 350 m, B covers (169/180*350)m  = 325 m

 

 

 

Therefore, C beats B by (350 - 325) m = 25 m.

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Filed Under: Races and Games

Q:

In a 100 m race, A beats B by 10 m and C by 13 m. In a race of 180 m, B will beat C by:

A) 5.4m B) 4.5m
C) 5m D) 6m
 
Answer & Explanation Answer: D) 6m

Explanation:

A : B = 100 : 90.

 

A : C = 100 : 87.

 

B/C = (B/A*A/C) = (90/100*100/87) = 30/29

 

When B runs 30 m, C runs 29 m.

 

When B runs 180 m, C runs (29/30*180)m =174m

 

 B beats C by (180 - 174) m = 6 m.

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Filed Under: Races and Games