A permeable substance is one

Which of the following is the correct definition of mole? (A) It is equal to the gram atomic mass of the substance (B) It contains 6.022 × 1020 atoms of the given substance (C) It is equal to the gram molecular weight of the substance (D) It contains 6.022 × 1023 molecules of the given substance

A

Options (A) (C) and (D)

B

Options (B) (C) and (D)

C

All options are correct

D

Option (C) and (D) only

Which of the following statement is correct? Statement 1: The addition of hydrogen to a substance and the removal of the oxygen from a substance is called oxidation. Statement 2: The addition of oxygen in a substance and the removal of Hydrogen from a substance is called reduction.

A

Statement 1 is correct

B

Statement 2 is correct

C

Both are correct

D

Both are incorrect

Consider the following statements about the loop of Henle: A) The Descending limb of the loop of Henle is permeable to water but impermeable to sodium chloride. B) The Ascending limb of the loop of Henle is permeable to sodium chloride but impermeable to water. Choose the correct statements.

A

Only A

B

Only B

C

Both A and B

D

Neither A nor B

A sanitary worker uses a white substance to clean water tanks. The substance has a strong smell of chlorine. The substance is-

A

Bleaching powder

B

Slaked lime

C

Baking powder

D

Common salt

Consider the following pairs regarding magnetic substances. I. Ferromagnetic Substance: Nickel II. Diamagnetic Substance: Silver III. Paramagnetic Substance: Sodium Which among the above is/are NOT correctly matched?

A

Only III

B

Only II

C

Both I and III

D

All I, II and III are correct

Mass of a substance is changing with respect to its volume as m = -v3 + 3v2 -2v, what is the maximum specific gravity of the substance between v = 1 m3 and v = 2 m3? (Density of reference substance = 0.25 kg/m3)

A

1

B

2

C

3

In sweet pea a white substance is first converted to a ___________ substance by 1st gene and that to a ______________ substance by 2nd gene to give a purple flower.

A

Yellow, purple

B

Green, purple

C

Purple, yellow

D

White, yellow

What is a permeable substance?

A

Any good conductor

B

Any bad conductor

C

Any strong magnet

D

Any substance through which the magnetic lines of force can pass easily

User level threads are threads that are visible to the programmer and are unknown to the kernel. The operating system kernel supports and manages kernel level threads. Three different types of models relate user and kernel level threads. Which of the following statements is/are true ? (a) (i) The Many - to - one model maps many user threads to one kernel thread (ii) The one - to - one model maps one user thread to one kernel thread (iii) The many - to - many model maps many user threads to smaller or equal kernel threads (b) (i) Many - to - one model maps many kernel threads to one user thread (ii) One - to - one model maps one kernel thread to one user thread (iii) Many - to- many model maps many kernel threads to smaller or equal user threads

A

(a) is true; (b) is false

B

(a) is false; (b) is true

C

Both (a) and (b) are true

D

Both (a) and (b) are false

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

A

$${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months

B

It will completely disintegrate in two months

C

It will completely disintegrate in four months

D

$${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months

A permeable substance is one

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