Q:

The mass of one molecule of oxygen is

A) 2.3 x 10-23 g	B) 3.3 x 10-23 g
C) 4.3 x 10-23 g	D) 5.3 x 10-23 g

Answer & Explanation Answer: D) 5.3 x 10-23 g

Explanation:

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Filed Under: Chemistry
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4 9266

Q:

Improve the bracketed part of the sentence.

I took for a ride the motorcycle (which Rohit has) bought yesterday.

A) that Rohit	B) that which Rohit has
C) that Rohit had	D) no improvement

Answer & Explanation Answer: A) that Rohit

Explanation:

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Filed Under: English
Exam Prep: Bank Exams

0 9265

Q:

Simpson and Harrison are associated with the invention of

A) Boson	B) Chloroform
C) Balloon	D) None of these

Answer & Explanation Answer: B) Chloroform

Explanation:

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Filed Under: Inventions

14 9260

Q:

Which of the following is/are 'rain cloud'?

1. Cirrus
2. Nimbostratus
3. Cumulonimbus
4. Altocumulus

A) 1 and 2 only	B) 2 and 3 only
C) 3 and 4 only	D) 1 and 4 only

Answer & Explanation Answer: B) 2 and 3 only

Explanation:

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Filed Under: General Awareness
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0 9256

Q:

A universal recipient belongs to the blood group

A) AB	B) O
C) B	D) A

Answer & Explanation Answer: A) AB

Explanation:

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Filed Under: General Awareness

44 9254

Q:

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at :

A) 518 nm	B) 1035 nm
C) 325 nm	D) 743 nm

Answer & Explanation Answer: D) 743 nm

Explanation:

$\frac{1}{λ} = \frac{1}{λ 1} + \frac{1}{λ 2}$

$\frac{1}{355} = \frac{1}{680} + \frac{1}{λ 2}$

$\frac{1}{λ 2} = \frac{680 - 355}{680 \times 355}$

$\Rightarrow λ 2 = 743 n m$ .

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Filed Under: Chemistry
Exam Prep: AIEEE

12 9247

Q:

What holds the sides of the DNA ladder together?

A) Polar covalent bonds	B) Ionic bonds
C) Metallic bonds	D) Covalent bonds

Answer & Explanation Answer: D) Covalent bonds

Explanation:

Deoxyribose, which is a pentose, and a phosphate group are the two molecules together form the two sides of the DNA i.e, A sugar (deoxyribose) and a phosphate.

DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase). Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases. The bases are adenine (A), thymine (T), cytosine (C) and guanine (G). A and T are connected by two hydrogen bonds. G and C are connected by three hydrogen bonds.

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Filed Under: Biology
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16 9236

Q:

Select the synonym of

decree

A) certificate	B) Law
C) title	D) award

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