Which of the following is a positively charged sol?
1. Methylene blue sol
2. Congo red sol
3. Siver sol
4. \(Sb_2S_3 ~sol\)
Subtopic: Colloidal Solution |
50%
From NCERT
NEET - 2023
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Select the correct statements regarding dissolved Oxygen and Biochemical Oxygen demand.
Choose the most appropriate answer from the options given below:
| A: | BOD is inversely related to dissolved oxygen |
| B: | Low dissolved oxygen and high BOD lead to loss of aquatic life. |
| C: | High BOD leads to high dissolved oxygen |
| D: | Both BOD and dissolved oxygen are indicator of health of a water body |
| E: | Both BOD and dissolved oxygen are affected by amount of organic matter in the water body. |
| 1. | (A), (B), (C), (E) only | 2. | (A), (B), (D), (E) only |
| 3. | (A), (B), (C), (D) only | 4. | (B), (C), (D), (E) only |
Subtopic: Water Pollution |
73%
From NCERT
NEET - 2023
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A copper wire of radius \(1\) mm contains \(10^{22}\) free electrons per cubic metre. The drift velocity for free electrons when \(10\) A current flows through the wire will be:
(Given, charge on electron = \(1.6\times10^{-19}\) C)
(Given, charge on electron = \(1.6\times10^{-19}\) C)
| 1. | \(\dfrac{6.25\times10^4}{\pi}\) m/s | 2. | \(\dfrac{6.25}{\pi}\times10^3\) m/s |
| 3. | \(\dfrac{6.25}{\pi}\) m/s | 4. | \(\dfrac{6.25\times10^5}{\pi}\) m/s |
Subtopic: Current & Current Density |
74%
From NCERT
NEET - 2023
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Match List -I with List-II
Choose the correct answer from the options given below
| List-I (Mixtures/Sample) |
List-II (Technique used for purification) |
||
| A. | Glycerol from spent lye | (I) | Steam distillation |
| B. | Chloroform + Aniline | (II) | Fractional distillation |
| C. | Fractions of crude oil | (III) | Distillation under reduced pressure |
| D. | Aniline+water | (IV) | Distillation |
Choose the correct answer from the options given below
| Options: | (A) | (B) | (C) | (D) |
| 1. | III | IV | II | I |
| 2. | IV | II | I | III |
| 3. | I | II | III | IV |
| 4. | I | III | II | IV |
Subtopic: Purification of Organic Compounds |
75%
From NCERT
NEET - 2023
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An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance \(x\) in front of the second wall. The required focal length of the lens will be:
| 1. | less than \(\dfrac x4\) |
| 2. | more than \(\dfrac x4\) but less than \(\dfrac x2\) |
| 3. | \(\dfrac x2\) |
| 4. | \(\dfrac x4\) |
Subtopic: Refraction at Curved Surface |
65%
From NCERT
NEET - 2023
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Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
1. Statement I is correct but Statement II is false
2. Statement I is incorrect but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false
| Statement I: | Parathyroid hormone acts on bones and stimulates the process of bone resorption |
| Statement II: | Parathyroid hormone along with Thyrocalcitonin plays a significant role in carbohydrate metabolism. |
1. Statement I is correct but Statement II is false
2. Statement I is incorrect but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false
Subtopic: Parathyroid |
71%
From NCERT
NEET - 2023
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If a conducting sphere of radius \(R\) is charged. Then the electric field at a distance \(r(r>R)\) from the centre of the sphere would be, (\(V=\) potential on the surface of the sphere):
| 1. | \(\dfrac{rV}{R^2}\) | 2. | \(\dfrac{R^2V}{r^3}\) |
| 3. | \(\dfrac{RV}{r^2}\) | 4. | \(\dfrac{V}{r}\) |
Subtopic: Electric Potential |
From NCERT
NEET - 2023
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How many number of tetrahedral voids are formed in 5 mol of a compound having cubic close packed structure? (Choose the correct option)
| 1. | \(1.550 \times10^{24}\) | 2. | \(3.011 \times10^{25}\) |
| 3. | \(3.011 \times10^{24}\) | 4. | \(6.022 \times10^{24}\) |
Subtopic: Voids, Radius Ratio & Coordination Number |
From NCERT
NEET - 2023
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A reaction among the following can generate isonitriles as a major product.
A. \(R-X + HCN \rightarrow \)
B. \(R-X + AgCN \rightarrow \)
C. \(R-X + KCN \rightarrow \)
D. \(R-X + NaCN \xrightarrow [C_2H_5OH] {H_2O} \)
Choose the most appropriate answer from the options given below:
A. \(R-X + HCN \rightarrow \)
B. \(R-X + AgCN \rightarrow \)
C. \(R-X + KCN \rightarrow \)
D. \(R-X + NaCN \xrightarrow [C_2H_5OH] {H_2O} \)
Choose the most appropriate answer from the options given below:
| 1. | (D) only | 2. | (C) and (D) only |
| 3. | (B) only | 4. | (A) and (B) only |
Subtopic: Chemical Properties |
76%
From NCERT
NEET - 2023
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Select the correct statements:
Choose the correct answer from the options given below:
| A: | Platyhelminthes are triploblastic, pseudocoelomate and bilaterally symmetrical organisms. |
| B: | Ctenophores reproduce only sexually and fertilization is external. |
| C: | In tapeworm, fertilization is internal but sexes are not separate. |
| D: | Ctenophores are exclusively marine, diploblastic and bioluminescent organisms. |
| E: | In sponges, fertilization is external and development is direct. |
Choose the correct answer from the options given below:
| 1. | (A), (C) and (D) only | 2. | (B), (C) and (D) only |
| 3. | (A) and (E) only | 4. | (B) and (D) only |
Subtopic: Phylum Porifera | Phylum Coelenterata | Phylum Ctenophora | Phylum Platyhelminthes |
67%
From NCERT
NEET - 2023
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