Q:

A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct?

A) 2 p.m. on Tuesday	B) 2 p.m. on Wednesday
C) 3 p.m. on Thursday	D) 1 p.m. on Friday

Answer & Explanation Answer: B) 2 p.m. on Wednesday

Explanation:

Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.

The Watch gains $(2 + 4 \frac{4}{5})$ min. or $\frac{34}{5}$ min.in 170 hrs.

Now, $\frac{34}{5}$ min.are gained in 170 hrs.

2 min.are gained in $(170 * \frac{5}{34} * 2)$ hrs=50 hrs

Watch is correct 2 days 2 hrs. after 12 p.m. on Monday i.e., it will be correct at 2 p.m. on Wednesday

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243 68865

Q:

Choose the pure substance from the list below.

A) Sugar	B) Lemonade
C) Air	D) Sea water

Answer & Explanation Answer: A) Sugar

Explanation:

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3 67651

Q:

________ is the process of dividing the disk into tracks and sectors

A) Tracking	B) Formatting
C) Crashing	D) Allotting

Answer & Explanation Answer: B) Formatting

Explanation:

The process of dividing the disk into tracks and sectors is called as formatting.

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416 67634

Q:

What is the Iupac name for the compound shown below.

clbr1527920257.png image

A) 1-Bromo-3-chlorocyclohexene	B) 2-Bromo-6-chlorocyclohex-1-ene
C) 6-Bromo-2-chlorocyclohexene	D) 3-Bromo-1-chlorocyclohex-1-ene

Answer & Explanation Answer: D) 3-Bromo-1-chlorocyclohex-1-ene

Explanation:

In chemical nomenclature, the IUPAC nomenclature of organic chemistry is a systematic method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC).

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43 67337

Q:

Which of the following reactions are exothermic?

$1) C + O_{2} \to {CO}_{2} 2) 2 Mg + O_{2} \to 2 MgO 3) {CuSO}_{4} + 5 H_{2} O \to {CuSO}_{4} . 5 H_{2} O 4) All the above$

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

Answer & Explanation Answer: D) 4

Explanation:

Here all the given options are Exothermic reactions. Exothermic reactions are those reactions which involves the release of heat.

Generally all the combining reactions are exothermic in nature.

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13 67142

Q:

Sort each description by the type of RNA it describes?

a) contains an anticodon
b) specifies the amino acid squence for a protein
c) contains exons
d) has amino acids covalently attached
e) is a component of ribosomes
f) is the most abundant form of RNA

A) a, b, d - tRNA, c - mRNA, e, f - rRNA	B) a, c - tRNA, b, d - mRNA, e, f - rRNA
C) a, e, f - rRNA, b - mRNA, c, d - tRNA	D) None of the above

Answer & Explanation Answer: A) a, b, d - tRNA, c - mRNA, e, f - rRNA

Explanation:

Option A)

a, b, d - tRNA, c - mRNA, e, f - rRNA

Is the given sorted description that describes the RNA type.

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41 67057

Q:

The function of BIOS is to

A) Initialize the system hardware components	B) Update the system
C) Ensure system performance	D) Save the system from crashing

Answer & Explanation Answer: A) Initialize the system hardware components

Explanation:

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28 66305

Q:

Silver Mirror test is given by which one of the following compounds?

1. Benzophenone

2. Acetaldehyde

3. Acetone

4. Formaldehyde

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

Answer & Explanation Answer: D) 2 and 4

Explanation:

Both Formaldehyde and Acetaldehyde will give this test

$H C H O \overset{[A g (N H_{3})_{2}^{+}]}{\to} \overset{A g}{S i l v e r m i r r o r} + O r g a n i c c o m p o u n d$

$C H_{3} - C H O \overset{[A g (N H_{3})_{2}^{+}]}{\to} \underset{S i l v e r m i r r o r}{A g} + O r g a n i c c o m p o u n d$

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