PRL Scientific Assistant Chemistry Paper | Physical Research Laboratory Scientific Assistant Chemistry Paper 2019
Date of Exam – 10.02.2019
PRL Scientific Assistant Chemistry Previous Paper 2019
| Sr. No. | Questions |
| 1 | The operation of mirroring the image of one hard disk to another is done by
(a) Only (1) above (b) Only (2) above (c) Both (3) & (4) above (d) Only (4) above Ans- (c) |
| 2 | Which among the following has the lowest energy?
(a) Transition state (b) Intermediate state (c) Both transition and intermediate state (d) Depends on the molecule Ans-(b) |
| 3 | Similar size cubes of sugar and salt were dropped on to a tall container filled with water. Which of following will be observed ?
(a) Sugar will dissolve faster (b) Salt will dissolve faster (c) Both dissolve at the same rate (d) Both cubes will touch the bottom of the container Ans – (a) |
| 4 | The temperature of the system decreases in an _____
(a) Adiabatic compression (b) Isothermal expansion (c) Isothermal compression (d) Adiabatic expansion Ans-(d) |
| 5 | The potential energy of the molecules of an ideal gas is
(a) Equal to their Kinetic Energy (b) Equal to the Internal energy (c) Zero (d) Equal to the external work Ans-(c) |
| 6 | Which of the following symbol represents the element Thallium?
(a) Th (b) Ta (c) Tl (d) Tm Ans-(c) |
| 7 | Temporary hardness of water is due to the presence of
(a) Calcium and magnesium hydroxides (b) Calcium and magnesium carbonates (c) Calcium and magnesium bicarbonates (d) Sodium and potassium sulphates Ans-(c) |
| 8 | Photelectric effect is maximum in
(a) Na (b) K (c) Cs (d) Li Ans-(c) |
| 9 | Glyerol decomposes at its boiling point. Purification of glycerol can be done by
(a) Distillation (b) Fractional distillation (c) Vacuum Distillation (d) Steam Distillation Ans-(c) |
| 10 | Deviation from Beer-Lambert Law usually found beyond certain concentration range is due to
(a) When monochromatic light is not used (b) Solute ionizes, dissociates or associates in solution (c) solute forms complexes (d) All of the above reasons Ans-(d) |
| 11 | How many elements are listed in the periodic table?
(a) 115 (b) 116 (c) 117 (d) 118 Ans-(d) |
| 12 | An inductor of inductance 2 H and zero resistance is connected to a 12 volt AC supply (frequency = 50 Hz). The current following through the inductor approximately is
(a) 15 mA (b) 25 mA (c) 19 mA (d) 12 mA Ans –(c) |
| 13 | The image of an object in a convex mirror of radius of curvature 24 cm is at 4 cm from the mirror. The position of the object from the mirror and the magnification are
(a) 6 cm & 2/3 (b) 4 cm & 1 (c) 3 cm & ¾ (d) 3 cm & 4/3 Ans –(a) |
| 14 | A disc of mass 100 g and radius 10 cm rotates about an axis O through its centre at 40 rpm. A lump of clay, mass 20 g, is dropped on the disc at a distance 8 cm from O. The final rpm approximately is
(a) 38 (b) 42 (c) 32 (d) 45 Ans –(c) |
| 15 | A small coin is placed on a horizontal platform that vibrates with constant frequency f0, with an amplitude 8 cm. The value of f0 for which the coin will lose contact with the platform is (9.8 mtr per second sq)
(a) 1.8 Hz (b) 3.2 Hz (c) 2.4 Hz (d) 1 Hz Ans –(a) |
| 16 | An object of mass 2 kg, moving with velocity 3 m/s collides with an object of mass 1 kg moving in the opposite direction with velocity 4m/s, and the two stick together. The velocity of the final system is
(a) 2 m/s (b) 1 m/s (c) 0 m/s (d) 2/3 m/s Ans –(d) |
| 17 | A ball of mass 2 kg attached to the hook of a spring balance is suspended vertically from the roof of a lift. The reading on the spring balance when the lift is ascending with a uniform velocity of 15 cm/s is (take g=10 mtr per second sq.)
(a) 1.98 kg (b) 2.02 kg (c) 2 kg (d) 2.3 kg Ans –(c) |
| 18 | A car moving with a velocity of 54 km/hr accelerates uniformly at the rate of 2 mtr per second sq. The distance travelled from the place where the acceleration began to where the velocity reaches 72 km/hr and the time taken approximately are
(a) 30 mtr & 4 second (b) 44 mtr & 2.5 second (c) 25 mtr & 3 second (d) 52 mtr & 5 second Ans – (b) |
| 19 | What is the correct meaning of idom “To drive home”?
(a) To find one’s roots (b) To return to place of rest (c) Back to original position (d) To emphasize Ans – (d) |
| 20 | A hall is 15 m long and 12 m board. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is
(a) 720 (b) 1200 (c) 900 (d) 1800 Ans –(b) |
| 21 | Which is the largest state of India by area?
(a) Uttar Pradesh (b) Madhya Pradesh (c) Maharashtra (d) Rajasthan Ans –(d) |
| 22 | Dr. B. R. Ambedkar was India’s first minister of
(a) Education (b) Law and Justice (c) Parliamentary Affairs (d) Commerce Ans –(b) |
| 23 | The first Indian to travel in space was
(a) Kalpana Chawla (b) Sunita Williams (c) Rakesh Sharma (d) Ravish Malhotra Ans –(c) |
| 24 | Find the missing number 2, 12, 60, 240, ?
(a) 720 (b) 540 (c) 480 (d) 380 Ans –(a) |
| 25 | A newspaper salesman sells 40% of his newspapers. He now has 360 newspapers left. How many newspapers did he begin with?
(a) 480 (b) 660 (c) 560 (d) 600 Ans-(d) |
| Data Collected By – K. Jeyanthi | |
| Published On – 2nd May 2020 | |
| Last Updated On – 2nd May 2023 | |
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