0
Q:

What is the compound interest earned at the end of 3 years?

I. Simple interest earned on that amount at the same rate and for the same period is Rs. 4500.

II.The rate of interest is 10 p.c.p.a.

III.Compound interest for 3 years is more than the simple interest for that period by Rs.465.

A) I and II only B) II and III only
C) I and III only D) Either II or III only

Answer:   D) Either II or III only



Explanation:

 

 

 

 

 

 

I. gives, S.I for 3 years = Rs. 4500.

 

 

 

II. gives, Rate = 10% p.a.

 

 

 

III. gives, (C.I.) - (S.I.) = Rs. 465.

 

 

 

Clearly, using I and III we get C.I. = Rs. (465 + 4500).

 

 

 

Thus, II is redundant.

 

 

 

Also, from I and II, we get sum =

 

 

 

100 x 4500

 

 

 

= 15000.

 

 

 

10 x 3

 

 

 

Now C.I. on Rs. 15000 at 10% p.a. for 3 years may be obtained.

 

 

 

Thus, III is redundant.

 

 

 

Either II or III is redundant.

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If  x=2+32-3, then what is the value of x+1/x ?

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Answer & Explanation Answer: A) 14

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If  x = 2+3, then what is the value of 2x + 12x ?

A) 23 B) 33
C) (33+1)/2 D) 1
 
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If x+1x = 4, then what is the value of x6+1x6 ?

A) 52 B) 256
C) 1026 D) 2702
 
Answer & Explanation Answer: D) 2702

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If y=2-x1+x, then what is the value of 1y+1 + 2y+1y2-1 ?

A) (1+x)(2-x)2x-1 B) (1-x)(2+x)x-1
C) (1+x)(2-x)1-2x D) (1+x)(1-2x)2-x
 
Answer & Explanation Answer: C) (1+x)(2-x)1-2x

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In the triangle ABC,∠BAC = 50° and the bisectors of ∠ABC and ∠ACB meets at P. What is the value (in degrees) of ∠BPC?

A) 100 B) 105
C) 115 D) 125
 
Answer & Explanation Answer: C) 115

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Q:

Two circles of same radius intersect each other at P and Q. If the length of the common chord is 30 cm and distance between the centres of the two circlesis 40 cm, then what is the radius (in cm) of the circles?

A) 25 B) 26
C) 27 D) 28
 
Answer & Explanation Answer: A) 25

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Q:

In the given figure, QRN = 40°, PQR = 46° and MN is a tangent at R. What is the value (in deg) of x, y and z respectively?

A) 40, 46, 94 B) 40, 50, 90
C) 46, 54, 80 D) 50, 40, 90
 
Answer & Explanation Answer: A) 40, 46, 94

Explanation:
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In ΔPQR, ∠R = 54°, the perpendicular bisector of PQ at S meets QR at T. If ∠TPR = 46°, then what is the value (in degrees) of ∠PQR?

A) 25 B) 40
C) 50 D) 60
 
Answer & Explanation Answer: B) 40

Explanation:
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