Free Mock Test for GATE Life Science (XL)

By Kamal Pandey / May 28, 2021 / PhD Entrance

GATE 2018 General Aptitude and Chemistry Question Quiz

Here we have provided GATE 2018 questions from chemistry and general aptitude. This will help you in understanding the difficulty level and make you familiar with the question types that are asked in the examination. Solve these questions to score more on the entrance exam.

Solve Biochemistry, Botany, Zoology, Microbiology and Food tech

“Going by the _________ that many hands make light work, the school _______ involved all the students in the task.” The words that best fill the blanks in the above sentence are

principle, principal

principal, principle

principle, principle

principal, principal

None

“Her _______ should not be confused with miserliness; she is ever willing to assist those in need.” The word that best fills the blank in the above sentence is

cleanliness

punctuality

frugality

greatness

None

Seven machines take 7 minutes to make 7 identical toys. At the same rate, how many minutes would it take for 100 machines to make 100 toys?

100

700

None

A rectangle becomes a square when its length and breadth are reduced by 10 m and 5 m,
respectively. During this process, the rectangle loses 650 m² of area. What is
the area of the original rectangle in square meters?

1125

2250

2924

4500

None

A number consists of two digits. The sum of the digits is 9. If 45 is subtracted from the number, its digits are interchanged. What is the number?

None

For integers a, b and c, what would be the minimum and maximum values respectively of a + b + c if log |a| + log |b| + log |c| = 0?

-3 and 3

-1 and 1

-1 and 3

1 and 3

None

Given that a and b are integers and a + a² b³
is odd, which one of the following statements is correct?

a and b are both odd

a and b are both even

a is even and b is odd

a is odd and b is even

None

From the time the front of a train enters a platform, it takes 25 seconds for the back of the train to leave the platform, while travelling at a constant speed of 54 km/h. At the same speed, it takes 14 seconds to pass a man running at 9 km/h in the same direction as the train. What is the length of the train and that of the platform in meters, respectively?

210 and 140

162.5 and 187.5

245 and 130

175 and 200

None

Consider the following three statements:

(i) Some roses are red.
(ii) All red flowers fade quickly.
(iii) Some roses fade quickly.
Which of the following statements can be logically inferred from the above statements?

If (i) is true and (ii) is false, then (iii) is false.

If (i) is true and (ii) is false, then (iii) is true.

If (i) and (ii) are true, then (iii) is true.

If (i) and (ii) are false, then (iii) is false.

None

10.

For the complete combustion of graphite and diamond in oxygen individually, the standard
enthalpy change (ΔH^o₂₉₈) values are -393.5 kJ mol^-1and -395.4 kJ mol^-1, respectively.
Then, the ΔH^o₂₉₈for the conversion of graphite into diamond is

+1.9 kJ mol^-1

-1.9 kJ mol^-1

+3.8 kJ mol^-1

-3.8 kJ mol^-1

None

1 out of 2

11.

For a 4s orbital of hydrogen atom, the magnetic quantum number (m_l) is

None

12.

Hybridization of xenon in XeF₂is

sp²

sp³

sp³d

None

13.

The total number of possible stereoisomers for the compound with the structural formula
CH₃CH(OH)CH=CHCH₂CH₃is _______.

14.

Among B-H, C-H, N-H and Si-H bonds in BH₃, CH₄, NH₃and SiH₄B, respectively, the
polarity of the bond which is shown INCORRECTLY is

B^δ+-H^δ-

C^δ--H^δ+

N^δ--H^δ+

Si^δ--H^δ+

None

15.

Among the following statements,

(i) [NiCl₄]^2-(atomic number of Ni = 28) is diamagnetic
(ii) Ethylamine is a weaker Lewis base compared to pyridine
(iii) [NiCl₂{P(C₆H₅)₃}₂] has two geometrical isomers
(iv) Bond angle in H₂O is greater than that in H₂S,
the CORRECT one is

(i)

(ii)

(iii)

(iv)

None

16.

In [Mn(H₂O)₆]²⁺ (atomic number of Mn = 25), the d-d transitions according to crystal fieldtheory (CFT) are

Laporte forbidden and spin forbidden

Laporte allowed and spin allowed

Laporte forbidden and spin allowed

Laporte allowed and spin forbidden

None

17.

The standard reduction potential (E^o) for the conversion of Cr₂O₇^2- to Cr³⁺ at 25 ^oC in an
aqueous solution of pH 3.0 is 1.33 V. The concentrations of Cr₂O₇^2- and Cr³⁺ are
1.0 × 10^-4 M and 1.0 × 10^-3 M, respectively. Then the potential of this half-cell reaction is
(Given: Faraday constant = 96500 C mol^-1, Gas constant R = 8.314 J K^-1 mol^-1)

1.04 V

0.94 V

0.84 V

0.74 V

None

18.

The solubility product (K_sp) of Mg(OH)₂ at 25^o C is 5.6 × 10^-11. Its solubility in
water is S × 10^-2 g/L, where the value of S is _______ (up to two decimal places).
(Given: Molecular weight of Mg(OH)₂ = 58.3 g mol^-1)

19.

The activation energy (E_a) values for two reactions carried out at 25 ^oC differ by 5.0 kJ mol^-1.
If the pre-exponential factors (A₁ and A₂) for these two reactions are of the same magnitude,
the ratio of rate constants (k₁/k₂) is _______ (up to two decimal places).
(Given: Gas constant R = 8.314 J K^-1 mol^-1)

20.

One mole of helium gas in an isolated system undergoes a reversible isothermal expansion at 25 ^oC from an initial
volume of 2.0 liters to a final volume of 10.0 liters. The change in entropy (ΔS) of the surroundings is ______ J K^-1.
(Given: Gas constant R = 8.314 J K^-1 mol^-1)

2 out of 2