35
Q:

A room is half as long again as it is broad. The cost of carpeting the at Rs. 5 per sq.m is Rs. 270 and the cost of papering the four walls at Rs. 10 per sq.m is Rs. 1720. If a door and 2 windows occupy 8 sq. m, find the dimensions of the room.

A) b=6; l=18; H=6 B) b=5; l=6; H=18
C) l=6; b=18; H=15 D) l=5; b=18; H=18

Answer:   A) b=6; l=18; H=6



Explanation:

Let breadth = x metres, length = 3x metres, height = H metres. 

Area of the floor=(Total cost of carpeting)/(Rate) = (270/5) sq.m = 54 sq.m 

x×3x2=54x2=54×2x=6  

So, breadth = 6 m and length =362 = 9 m.

Now, papered area = (1720/10) =  172 sq.m 

Area of 1 door and 2 windows = 8 sq.m 

Total area of 4 walls = (172 + 8) sq.m = 180 sq.m 

2×9+6H=180H=6

Q:

A, B and C are three points on a circle such that the angles subtended by the chord AB and AC at the centre O are 110 and 130 deg, respectively. Then the value of angle BAC is:

 

A) 70 deg B) 75 deg
C) 60 deg D) 65 deg
 
Answer & Explanation Answer: C) 60 deg

Explanation:
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0 27
Q:

In ABC, MN BC, the area of quadrilateral MBCN=130 sqcm. If AN : NC = 4 : 5, then the area of MAN is:

 

A) 40 sq.cm B) 45 sq.cm
C) 32 sq.cm D) 65 sq.cm
 
Answer & Explanation Answer: C) 32 sq.cm

Explanation:
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0 14
Q:

The radius of a circular garden is 42 m. The distance (in m) covered by running 8 rounds around it, is:

 

A) 2112 B) 1124
C) 3248 D) 4262
 
Answer & Explanation Answer: A) 2112

Explanation:
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0 13
Q:

Two chords AB and CD of a circle when produced, meet at a point P outside the circle. If AB = 6 cm, PB = 5 cm, PD = 4 cm, then CD is equalto:

 

A) 7.5 cm B) 8.25 cm
C) 9.75 cm D) 7.75 cm
 
Answer & Explanation Answer: C) 9.75 cm

Explanation:
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0 34
Q:

In ABC, AD is a median and is a point on AD such that AP : PD = 3 : 4. Then ar( BPD) : ar( ABC)is equal to:

 

A) 2 : 7 B) 4 : 7
C) 2 : 5 D) 1 : 3
 
Answer & Explanation Answer: A) 2 : 7

Explanation:
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0 25
Q:

The arc ABC of a circle with centre O subtends 132 at the centre. The chord AB is extended to the point P. The angle CBP is equal to

 

A) 48 deg B) 66 deg
C) 76 deg D) 68 deg
 
Answer & Explanation Answer: B) 66 deg

Explanation:
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0 31
Q:

In a circle of radius 13 cm, a chord is at a distance of 5cm from its center. What is the length of the chord?

 

A) 24 cm B) 18 cm
C) 12 cm D) 20 cm
 
Answer & Explanation Answer: A) 24 cm

Explanation:
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1 53
Q:

In ABC,P is a point on BC such that BP : PC = 3 : 4 and Q is the midpoint of AP. Then ar( ABQ): ar( ABC) is equal to:

 

A) 3 : 8 B) 2 : 7
C) 1 : 4 D) 3 : 14
 
Answer & Explanation Answer: D) 3 : 14

Explanation:
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0 67