Test: CSIR-NET Chemical Sciences Mock Test - 7 - CSIR NET Chemical Science MCQ

• Pancreatic juice require basic medium for their action.
• Pancreatic juice is a liquid secreted by the pancreas which contains a variety of enzymes, including trypsinogen, chymotrypsinogen, elastase, carboxypeptidase, pancreatic lipase, nucleases and amylase.
• Pancreatic juice is alkaline in nature due to the high concentration of bicarbonate ions. Bicarbonate is useful in neutralizing the acidic gastric acid, allowing for effective enzymic changes.

LCM denotes least common multiple hence the LCM of 10 & 15 simply means the least number which is a multiples 10,15,20,25.
LCM of fractions =Factorize of the above numbers :
10 = 2 * 5
15 = 3 * 5
20 = 5 *2 * 2
25= 5 * 5
5*5*3*2*2= 300
300 is least common multiple for four numbers 10, 15 and 20, 25.

• A Vector is any agent which carries the infectious pathogen from one person to another person.
• Arthropods form a major group of pathogen vectors with mosquitoes, flies, sand flies, lice etc. & the most common example is Anopheles mosquito which carries malaria parasite from one place to other.
• Some plants and fungi act as vectors for various pathogens.

Let C.P. of 1 article = A
C. P. of 20 articles = 20A
Profit = 25% = 25A/100 =A/4
Hence S.P. = C.P.+ profit = A+(A/4) = 5A/4
Let S. P. of x articles = 5Ax/4
As C. P. of 20 articles = S.P. of x articles
Hence
20A = 5Ax/4
5x = 80
⇒ x= 16

In a plane mirror, a mirror image is a reflected duplication of an object that appears almost identical, but it is reversed in the direction perpendicular to the mirror surface. As an optical effect, it results from the reflection of substances such as a mirror or water.

Hence, option B is the correct answer.

6 + 1² = 7
7 + 4 (2²) = 11
11 + 9 (3²) = 20
20 + 16 (4²) = 36
Hence, option D is the correct answer.

The possible Venn – diagram is -

Conclusions:
I. Some clips are pens – False, as it is not a definite case.
II. No clips are pens – False, as it is not a definite case.
III. Some pens are not pins – False, as it is not a definite case.
Here, all conclusions are false, but conclusion I and II both are complementary pairs therefore, either I or II follows.
Hence, the correct answer is option C.

When any constant a is added to all elements of a dataset, the mean and median are increased by the same constant.
⇒ Mean of C = 2023 + Mean of A
Also, Median of C = 2023 + Median of A
On adding a constant to all elements of dataset, there is no change in the variance and the range(maximum - minimum).
⇒ Variance of C = Variance of A
And, Range of C = Range of A
⇒ (Maximum – Minimum) of C = (Maximum – Minimum) of A
∴ The incorrect statement is (Maximum – Minimum) of C = 2023 + (Maximum – Minimum) of A.

Given: Need to fill 1 to 9 numbers in the square without repetition. 

In the given figure, the places of all the numbers can be changed except 5 & 8. 
So comparing from given figure in question, A = 8
Hence, Option 3 is correct.

Given the conditions that a + b, b + c, c + d, d + e, and e + 7 have the same value
⇒ a + b = b + c = c + d = d + e = e + 7
From a + b = b + c, we can infer that a = c.
From b + c = c + d, we can infer that b = d.
From c + d = d + e, we can infer that c = e.
From d + e = e + 7, we can infer that d = 7
Substituting these values into the equation a + b = b + c, we have:
a + b = b + c
⇒ a + b = b + e (since c = e)
⇒ a = e
⇒ a = 7 + e - 7
⇒ a = d + e - 7
∴ The value of d + e - 7 is always the same as the value of a.

Let the quantity of sugar B in the mixture be x kg.
Given, the mixture contains 500 kg of A
The cost of sugar A per kg is Rs. 40,
⇒ Total cost of sugar A in the mixture = 500 × 40 = Rs. 20,000.
Similarly, the cost of sugar B per kg is Rs. 50,
⇒ The total cost of sugar B in the mixture = x × 50 = Rs. 50x.
∴ The total cost of the mixture = Rs. (20,000 + 50x).
The mixture was sold for Rs. 88,000 with a 10% gain,
⇒ The selling price was 110% of the total cost.
⇒ 110% of (20,000 + 50x) = 88,000.
⇒1.1 ×  (20,000 + 50x) = 88,000.
⇒ 22,000 + 55x = 88,000.
⇒ 55x = 66,000.
⇒ x = 1,200.
∴ The mixture contained 1,200 kg of sugar B.

Dividing sixty by half means dividing sixty by 0.5, which is equivalent to multiplying sixty by 2.
⇒ Dividing sixty by half can be written as 60 / (1/2)
= 60 × 2 = 120.
Adding half of forty means adding 0.5 × 40 = 20 to the result. 
∴ Dividing sixty by half and adding half of forty yields 120 + 20 = 140.

From the graph, we can see that as the percentage of people drinking alcohol increases, the number of deaths per year increases as well.
⇒ Percentage of people drinking alcohol is directly proportional to deaths per year
∴ We can definitely conclude that drinking alcohol kills people.

Given, speed of A = 4 m/s and Speed of B = 6 m/s
Length of track = 3600m
To complete 1 lap on the track, time taken by A = 3600/4 = 900 s
Similarly, time taken by B to complete 1 lap on track = 600 s
Now, by the time A completes 1 lap, B will have completed = 900/600 = 1.5 lap
Hence, after 900 seconds their position will be like the following:

Distance between A and B = 1800 m
Let A and B meet at a distance of x from B.

⇒ 4x = 6 × 1800 - 6x
⇒ 10x = 10800
⇒ x = 1080
∴ Time taken to travel x distance = x/6 = 1080/6 = 180 s
∴ Total time before A and B cross each other = 900 + 180 = 1080 s.
∴ After 1080 seconds of starting the run would they cross for the first time.

We know that Earth is divided into 24 time zones, each spanning 15 degrees of longitude. This means that each time zone represents a one-hour difference in local time.
Assuming the Earth's rotation rate is doubled, it means the Earth completes one full rotation in half the time it currently takes. As a result, the longitudes and time zones would still remain the same, but the time difference between them would be halved.
The distance between 30°E and 60°E longitudes is 30°.
In the equatorial region, this corresponds to a time difference of 2 hours (since each time zone spans 15 degrees).
However, with the rotation rate doubled, the time difference between 30°E and 60°E longitudes would be halved, resulting in a time difference of 1 hour = 60 × 60 = 3600 seconds.
∴ The time difference (in standard seconds) between 30°E and 60°E longitudes in the equatorial region will be 3600.

Separation of inorganic cations or complexes is done using paper chromatography. Column chromatography is a method used to purify individual chemical compounds from mixtures of compounds.

Antoine equation is a relation between Vapour pressure and Temperature.

Aromatic hydrocarbons undergo both electrophilic and nucleophilic aromatic substitutions.

Cleaving of ester molecules into carboxylic acid and alcohol that is triglyceride is treated with a strong base, which cleaves the ester bond, releasing fatty acid salts (soaps) and glycerol.

All the aromatic hydrocarbon are ring shaped as all of them are sp2 hybridized with a geometry of trigonal planar.

According to Newton’s law of viscosity, the maximum velocity of flow is at the middle of the tube. It states that for a given shear stress acting on a fluid element, the rate at which the fluid deforms is inversely proportional to the viscosity.

Paper chromatography is used for the structural analysis. Paper chromatography is an analytical method that is used to separate colored chemicals or substances.

Melting is a process which proceeds by changing from a highly ordered state to a disordered state.

Depending on the nature of the alkali used in their production, soaps have distinct properties. Sodium hydroxide (NaOH) gives “hard soap”; hard soaps can also be used in water containing Mg, Cl, and Ca salts.

The viscosity of a fluid is inversely proportional to the distance between two adjacent layers.

The energy required to rotate n-butane molecule about the carbon-carbon bond is called torsional energy. Torsion energy can be used to solve problems of general relativity especially the singularity problem.

Lye is another name for a strongly basic solution. Mostly it is a solution of sodium hydroxide.

Dip pen nanolithography is an example of "bottom-UP" approach for the preparation of nanomaterials. All the other options are the example of top-down approach.