2
Q:

In an examination, a student scores 4 marks for every correct answer and loses I mark for every wrong answer. If he attempts in all 60 questions and secures 130 marks, the number of questions he attempts correctly, is:

A) 35 B) 38
C) 40 D) 42

Answer:   B) 38



Explanation:

Let the number of correct answers be X.

Number of incorrect answers = (60 – X).

Therefore, 4x – (60 – x) = 130 

=> 5x = 190  => x = 38

Q:

If x = 283, y = 273 then the value of  x + y - 1x2 + xy + y2 is

 

A) 8 B) 7
C) 6 D) 5
 
Answer & Explanation Answer: C) 6

Explanation:
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0 0
Q:

If tanα = 2, then the value of sinαsin3α + cos3α is

 

A) 2/9 B) √5/9
C) 10/9 D) 5√5/9
 
Answer & Explanation Answer: C) 10/9

Explanation:
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0 1
Q:

If 2 tan2θ = 6 and 0° < θ < 45°, then the value of  sinθ + 3cosθ - 2tan2θ is

 

A) 2/3 B) 4/3
C) 2 D) 8/3
 
Answer & Explanation Answer: B) 4/3

Explanation:
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0 9
Q:

If x2 + y2 + z2 = 14 and xy+ yz + zx = 11, then the value of (x + y + z)2 is

 

A) 16 B) 25
C) 36 D) 49
 
Answer & Explanation Answer: C) 36

Explanation:
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0 2
Q:

1a - 1b = 0, then the value of 1a + 1b is

 

A) 1ab B) ab
C) 2ab D) 12ab
 
Answer & Explanation Answer: C) 2ab

Explanation:
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0 1
Q:

Simplify the following expression:

(32×16)+(53×72)-(134×43)=?

 

A) 1221 B) 2112
C) 3621 D) 4112
 
Answer & Explanation Answer: B) 2112

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4 281
Q:

(311×336)-(94×123)+(511×2210)

 

A) -92 B) -132
C) 132 D) 92
 
Answer & Explanation Answer: B) -132

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0 409
Q:

Express in meters the sum of 0.5035 km, 332.9 cm, and 1771mm:

 

A) 500 B) 510
C) 508.6 D) 58.6
 
Answer & Explanation Answer: C) 508.6

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0 274