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Q:

The L.C.M of 22, 54, 108, 135 and 198 is

A) 330	B) 1980
C) 5940	D) 11880

Answer & Explanation Answer: C) 5940

Explanation:

22 = 2 x 11

54 = $2 \times 3^{3}$

108 = $2^{2} \times 3^{3}$

135 = $3^{3} \times 5$

198 = $2 \times 3^{2} \times 11$

$∴ L . C . M = 2^{2} \times 3^{3} \times 5 \times 11 = 5940$

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Filed Under: HCF and LCM

Q:

Which of the following has most number of divisors?

A) 99	B) 101
C) 176	D) 182

Answer & Explanation Answer: C) 176

Explanation:

99 = 1 x 3 x 3 x 11

101= 1 x 101

176= 1 x 2x 2 x 2 x 2 x 11

182= 1 x 2 x 7 x 13

So, divisors of 99 are 1, 3, 9, 11, 33, 99

divisors of 101 are 1,101

divisors of 176 are 1, 2, 4, 8, 16, 22, 44, 88, 176

divisors of 182 are 1, 2, 7, 13, 14, 26, 91, 182

Hence , 176 hasthe most number of divisors.

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Filed Under: HCF and LCM

Q:

Who is often called the 'first African-American' inventor?

A) Bessie Blount	B) George Washington Carver
C) Benjamin Banneker	D) Elijah McCoy

Answer & Explanation Answer: C) Benjamin Banneker

Explanation:

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Filed Under: Inventions

Q:

Where were wigs first invented?

A) Japan	B) France
C) Egypt	D) China

Answer & Explanation Answer: C) Egypt

Explanation:

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Filed Under: Inventions

Q:

Who was the first person to patent the JET ENGINE?

A) F. Whittle	B) C. Lindbergh
C) W. Histell	D) B. Owings

Answer & Explanation Answer: A) F. Whittle

Explanation:

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Filed Under: Inventions

Q:

Which scientist discovered the radioactive element radium?

A) Isaac Newton	B) Marie Curie
C) Benjamin Franklin	D) None of these

Answer & Explanation Answer: B) Marie Curie

Explanation:

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Filed Under: Inventions

Q:

Who invented the BALLPOINT PEN?

A) Write Brothers	B) Waterman Brothers
C) Biro Brothers	D) Bicc Brothers

Answer & Explanation Answer: C) Biro Brothers

Explanation:

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Filed Under: Inventions

Q:

It travels over land and water. Who invented the HOVERCRAFT?

A) C. Cockerell	B) S. Sperrow
C) O. Stricheg	D) T. Henman

Answer & Explanation Answer: A) C. Cockerell

Explanation:

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Filed Under: Inventions

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