Q:

What causes brownian motion in colloids?

A) coagulation of particles and the dispersed phase B) erratic flashes of light
C) molecules of the dispersion medium colliding with dispersed phase particles D) All the above
 
Answer & Explanation Answer: C) molecules of the dispersion medium colliding with dispersed phase particles

Explanation:

When their is a colloid in the solution, then it will show the Brownian movement, such as dust particle in the air will show the Brownian movement.

 

Hence, Brownian movement arises due to the impact of the molecules of the dispersion medium with the colloidal particles. It has been postulated that the impact of the molecules of dispersion medium on the colloidal particles are unequal.

 

This leads to the zig-zag (random) motion of the colloidal particles.

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Filed Under: Physics
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6 5225
Q:

We remember Charles Babbage (1792-1871) for what ?

A) Computers B) Radio-Telegraphy
C) Steam Boating D) Telescopes
 
Answer & Explanation Answer: A) Computers

Explanation:
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Filed Under: Inventions

9 5224
Q:

Cotton is facing competition form Sugarcane in the region of the black soil in Maharashtra. This is due to 

A) Declined yield of cotton in this region B) A General Change in the climate of this region
C) Expansion of irrigation for which this region has become suitable for sugar-cane cultivation which is a profitable crop D) Increasing demand for Sugar and rising prices of sugar in the country
 
Answer & Explanation Answer: C) Expansion of irrigation for which this region has become suitable for sugar-cane cultivation which is a profitable crop

Explanation:
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Filed Under: Indian Geography

30 5224
Q:

Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4000 for 2 years at 10% per annum. The sum placed on simple interest is

A) Rs.1650 B) Rs.1550
C) Rs.1750 D) Rs.1850
 
Answer & Explanation Answer: C) Rs.1750

Explanation:

C.I. =Rs[4000x(1+10/100)²-4000]

Rs.(4000x11/10x11/10-4000) = Rs.940.

Sum

=Rs. [420 *100 /3 * 8]

= Rs.1750.

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3 5224
Q:

The book which deals with the love plays of the Dark Lord Krishna and his fair beloved Radha.

A) Meghdoot B) Raghuvamsa
C) Geet Govinda D) Padmavat
 
Answer & Explanation Answer: C) Geet Govinda

Explanation:
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13 5223
Q:

What will come in place of the question mark in the series below?

7, 4.5, 5.5, 12, 49, ?

A) 393 B) 396
C) 354 D) 367
 
Answer & Explanation Answer: A) 393

Explanation:

Ans. 
4.5 = 7 x 0.5 + 1
5.5 = 4.5 x 1 + 1
12 = 5.5 x 2 + 1
49 = 12 x 4 + 1
? = 49 x 8 + 1, i.e. ? = 393

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2 5222
Q:

The oldest specimens of poetry in the punjabi language are devotional compositions attributed to

A) Guru Nanak B) Baba Farid
C) Guru Angad D) Guru Tegh Bahadur
 
Answer & Explanation Answer: B) Baba Farid

Explanation:
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Filed Under: Indian History

4 5222
Q:

A six-digit number is formed by repeating a three-digit number; for example, 404404 or 415415 etc. Any number of this form is always exactly divisible by 

A) 101 B) 901
C) 1001 D) 789
 
Answer & Explanation Answer: C) 1001

Explanation:

Here by trial and error method, we can obseve that

404404 = 404 x 1001; 415415 = 415 x 1001, etc.

So, any number of this form is divisible by 1001.

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Filed Under: Numbers
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7 5221