Aptitude and Reasoning Questions

Q:

Lami's theorem is applicable only for

A) Non-Concurrent forces B) Coplanar forces
C) Coplanar and concurrent forces D) Any type of forces
 
Answer & Explanation Answer: C) Coplanar and concurrent forces

Explanation:

The Lami's theorem states that " If three forces coplanar and concurrent forces acting on a particle keep it in equilibrium, then each force is proportional to the sine of the angle between the other two and the constant of proportionality is the same." This theorem is derived from the Sine rule of triangles.

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Filed Under: Arithmetical Reasoning
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Q:

In the following question a letter-series is given, in which some letters are missing. The missing letters are given in the proper sequence as one of the alternatives. Choose the correct alternatives. ba_ba_bac_acb_cbac

A) bbca B) ccba
C) cbac D) aacb
 
Answer & Explanation Answer: B) ccba

Explanation:

The series is bac/bac/bac/bac/bac/bac.
The pattern bac is repeated.

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Filed Under: Number Series

32 10697
Q:

P's father is Q's Son. M is the paternal uncle of P and N is the brother of Q. How is N related to M? 

A) Brother B) Nephew
C) Cousin D) None of these
 
Answer & Explanation Answer:

Explanation:
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Filed Under: Blood Relations

63 10685
Q:

Suppose you can travel from a place A to a place B by 3 buses, from place B to place C by 4 buses, from place C to place D by 2 buses and from place D to place E by 3 buses. In how many ways can you travel ?from A to E?

A) 36 B) 64
C) 74 D) 72
 
Answer & Explanation Answer: D) 72

Explanation:

 

The bus fromA to B can be selected in 3 ways.

The bus from B to C can be selected in 4 ways.

The bus from C toD can be selected in 2 ways.

The bus fromD to E can be selected in 3 ways.

So, by the General Counting Principle, one can travel fromA to E in 3 x 4 x 2 x 3 ways = 72

 

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2 10672
Q:

How many digits will be there to the right of the decimal point in the product of 95.75 and 0.2554 ?

A) 6 B) 7
C) 8 D) 9
 
Answer & Explanation Answer: A) 6

Explanation:

Sum of the decimal places = 7 .

Since  the last digit to the extreme right  wil be zero ( 5 * 4 = 20),  so there will be  6  significant digits to the right of the decimal point....

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Filed Under: Decimal Fractions

13 10671
Q:

A train travelling with a speed of 60 km/hr catches another train travelling in the same direction and then leaves it 120m behind in 18 seconds. The speed of the second train is

A) 42 kmph B) 72 kmph
C) 36 kmph D) 44 kmph
 
Answer & Explanation Answer: C) 36 kmph

Explanation:

Given speed of the first train = 60 km/hr = 60 x 5/18 = 50/3 m/s

Let the speed of the second train = x m/s

Then, the difference in the speed is given by

503 - x = 12018

=> x = 10 m/s

=> 10 x 18/5 = 36 km/hr

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Filed Under: Problems on Trains
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21 10669
Q:

The calendar of year 1939 is same as which year?

A) 1943 B) 1964
C) 1950 D) 1956
 
Answer & Explanation Answer: C) 1950

Explanation:

Given year 1939, when divided by 4 leaves a remainder of 3.

NOTE: When remainder is 3, 11 is added to the given year to get the result.

So, 1939 + 11 = 1950

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Filed Under: Calendar

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Q:

Maneela lent Rs. 8000 partly at the rate of 5% and partly at the rate of 6% per annum simple interest. The total interest she get after 2 years is Rs. 820, then in which ratio will Rs. 8000 is to be divided?

A) 7:1 B) 13:5
C) 15:7 D) 2:7
 
Answer & Explanation Answer: A) 7:1

Explanation:

Maneela lent Rs. 8000 in two parts,

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Filed Under: Ratios and Proportions
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