Previous year question paper of JCECE or Jharkhand Combined Entrance Competitive Examination for preparation of the exam is as follows:

Q1- An amplifier has a Rin = 1.2 k. The coupling capacitor is 1 F. Determine the approximate lower cutoff frequency.

133 Hz
33 kHz
3 kHz
133 kHz
Ans. A

Q2- The friction experienced by a body, when in motion, is known as

Rolling Friction
Dynamic Friction
Limiting Friction
Static Friction
Ans. B

Q3- Euler’s formula holds good only for

Short Columns
Long Columns
Both Short And Long Columns
Weak Columns
Ans. B

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Q4- A roll-off of 20 dB per decade is equivalent to a roll-off of ________ per octave.

3 dB
13 dB
12 dB
6 dB
Ans. D

Q5- Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity

v
v/2
v/4
v/8
Ans. B

Q6- Strain energy is the

Energy Stored In A Body When Strained Within Elastic Limits
Energy Stored In A Body When Strained Upto The Breaking Of A Specimen
Maximum Strain Energy Which Can Be Stored In A Body
Proof Resilience per unit volume of a material
Ans. A

Q7- The amount of CSF in the cranial cavity

500 ml
140 ml
1 litre
5 ml
Ans. B

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Q8- Electric potential of the brain is recorded by

CT Scan
Sphygmomanometer
ECG
EEG
Ans. D

Q9- The cause of cretinism is

Hypothyroidism
Hypoparathyroidism
Hyperthyroidism
Hyperparathyroidism
Ans. A

Q10- In 24 hours, total glomerular filtrate formed in human kidney is

7 litres
7 litres
17 litres
170 litres
Ans. D

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Q11- Which one of the following bacterium is used for production of transgenic plants ?

Escherichia coli
Bacillus thuringiensis
Staphylococcus aureus
Agrobacterium tumefaciens
Ans. D

Q12- Kupffer’s cells are

Phagocytic
Mast cells
Hormone secreting
Digestive juice secreting
Ans. A

Q13- Movement of tongue muscle is controlled by

facial nerve
trigeminal nerve
hypoglossal nerve
vagus nerve
Ans. C

Q14- Amount of oxalic acid present in a solution can be determined by its titration with KMnO4solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

Reduces Permanganate To Mn2+.
Oxidises Oxalic Acid To Carbon Dioxide And Water.
Gets Oxidised By Oxalic Acid To Chlorine.
Furnishes H+ Ions In Addition to those from oxalic acid.
Ans. A

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Q15- Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is

R2SiCl2
R3SiCl
R4Si
RSiCl3
Ans. D

Q16- Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives

p-nitrophenol
o-nitrophenol
2,4,6-trinitrobenzene
nitrobenzene
Ans. B

Q17- Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotized and then heated with cuprous bromide. The reaction mixture so formed contains:

mixture of o-; and p-bromoanilines
mixture of o- and m-bromotoluenes
mixture of o- and p-bromotoluenes
mixture of o- and p-dibromobenzenes
Ans. C

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Q18- At 800 C, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm Hg. If a mixture solution of ‘A’ and ‘B’ boils at 800 C and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

48 mol percent
50 mol percent
52 mol percent
34 mol percent
Ans. B

Q19- In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement?

H2 is removed through occlusion with Pd.
CO is oxidised to CO2 with steam in the presence of a catalyst followed by absorption of CO2in alkali.
CO and H2are fractionally separated using differences in their densities.
CO is removed by absorption in aqueous Cu2Cl2solution.
Ans. B

Q20- The pKa of a weak acid, HA is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of corresponding salt, BA, will be

01
22
58
79
Ans. A