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DSSSB Delhi has published the Junior Scientific Assistant Recruitment 2026 in the discipline Biology, Ballistics, Quality Control, Photography, Cyber Forensic, Crime Scene, Mobile Forensic Unit, Finger Print and Physics. You can apply on or before 15th July 2026 throgh the official website https://dsssb.delhi.gov.in

Here, we are publishing the DSSSB Junior Scientific Assistant Model question paper, which will be helpful to you for the preparation of said examination.

ISRO Propulsion Complex Mahendragiri Scientific Assistant Chemistry Paper 2018
Date of Exam – 21st April 2018
Duration of Exam – 1 Hour 30 Minutes
No. of questions – 60 Nos.

Which one of the following groups of organic compound does not contain oxygen?
(a) Aldehyde
(b) Amine
(c) Ether
(d) Amide

How many kg of oxygen is required for complete combustion of 1 kg of methane?
(a) 1
(b) 4
(c) 16
(d) None of the above

Gross calorific value of propane is 2220 kJ/gmol. Calculate its Net calorific value (Latent heat of steam is 2440 kJ/kg)
(a) 2217.6 kJ/gmol
(b) 2195.6 kJ/gmol
(c) 2084.5 kJ/gmol
(d) 2044.3 kJ/gmol

Among the halogen acid, the weakest acid is
(a) HF
(b) HCL
(c) HBr
(d) HI

Which is the lighest gas?
(a) Helium
(b) Hydrogen
(c) Nitrogen
(d) Oxygen

How many kg of Nitrogen gas is required to fill a gas Cylinder of 100 litre water capacity to 25 MPa pressure at 280 K?
(a) 20 kg
(b) 30 kg
(c) 40 kg
(d) 50 kg

In a reversible reaction, the catalyst
(a) increases rate of forward reaction
(b) increases rate of backward reaction
(c) increases rate of both forward & backward reactions
(d) None of the above

Which among the following is used to produce artificial rain?
(a) Copper oxide
(b) Carbon monoxide
(c) Silver iodide
(d) Silver nitrate

Bleaching action of chlorine is by
(a) Decomposition
(b) Hydrolysis
(c) Reduction
(d) Oxidation

How many moles of carbon dioxide would result from the complete combustion of one mole of fructose?
(a) 4
(b) 6
(c) 10
(d) 12