Q:

Which statement describes the acid found in vinegar acetic acid ?

A) It feels slippery	B) It reacts with Mg to produce H2
C) It tastes bitter	D) It releases OH- in a solution

Answer & Explanation Answer: B) It reacts with Mg to produce H2

Explanation:

Acid which is present in vinegar is approximately 5 % of acetic acid. This can be confirmed by testing the vinegar with magnesium which gives out hydrogen as a gas.

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Q:

All atoms of uranium have the same

A) Atomic mass	B) Number of electrons
C) Atomic number	D) Mass number

Answer & Explanation Answer: C) Atomic number

Explanation:

There are many isotopes of uranium and all of them have same atomic number i.e, sum of nmber of neutrons and protons.

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Q:

The Kinetic energy of gas molecules

A) is unaffected by temperature variations	B) decreases with increase of temperature
C) increases with decrease of temperature	D) increases with increase of temperature

Answer & Explanation Answer: D) increases with increase of temperature

Explanation:

Kinetic Energy $K . E = \frac{1}{2} m V^{2}$ or

$K . E \propto V^{2}$ , Where 'm' is the mass and 'v' is the velocity of molecules.

Velocity is proportional to temperature. Hence, KE is proportional to temperature and would increase with temperature.

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Q:

An Oracle System Change Number (SCN):

A) is a value that is incremented whenever a dirty read occurs.	B) is incremented whenever a deadlock occurs.
C) is a value that keeps track of explicit locks.	D) is a value that is incremented whenever database changes are made.

Answer & Explanation Answer: D) is a value that is incremented whenever database changes are made.

Explanation:

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Q:

Which is the official language of Central Bank of West African Bank

A) French	B) Arabic
C) English	D) Hindi

Answer & Explanation Answer: A) French

Explanation:

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Q:

Hormones are chemicals secreted and regulated by the endocrine system.

A) TRUE

B) FALSE

Answer & Explanation Answer: A) TRUE

Explanation:

True. Hormones are chemicals secreted and regulated by the endocrine system.

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Subject: Biology
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Q:

A mixture of sand and naphthalene can be seperated by __________

A) Fractional distillation	B) Sublimation
C) Chromatography	D) Any of them

Answer & Explanation Answer: B) Sublimation

Explanation:

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Q:

Rabindranath Tagore was awarded Noble Prize for his literary work named

A) Geetanjali	B) Rajtarangini
C) Chokher Bali	D) None of these

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