General science questions

General science questions for railway exams Download pdf

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1. The  SI  unit of resistance is:

(1) Newton            (2) Coulomb           (3) Ohm                 (4) Joule                 (3)

Whereas the SI unit of electrical resistivity is the ohmmetre (Ωm).

2. Which of the following is a Saprotroph?

(1) Mushroom       (2) Man                  (3) Pigeon              (4) Algae                (1)

3. Momentum is measured as the product of:

(1) Mass and inertia                              (2) Mass and force  

(3) Mass and velocity                           (4) Mass and acceleration                    (3)

4. The reflector of a search light is a:

(1) convex mirror                                 (2) concave mirror     

(3) plane mirror                                    (4) cylindrical mirror                            (2)

5. The number of neutrons in an atom is equal to the:

(1) Mass number                                  (2) Atomic number    

(3) Mass number – atomic number      (4) Number of electrons                       (3)

6. Name the metal that can be easily cut with a knife:

(1)   Copper           (2) Gold                 (3) Sodium             (4) Aluminium       (3)

Metals (lithium, sodium, potassium) are so soft that they can be cut with a knife.

7. By which of the following processes are metals of high reactivity extracted from purified molten ore?

(1)  Reduction by an appropriate reducing agent   

(2) Roasting                                          (3) Electrolysis      (4) Calcination       (3)

8. When a number of resistors are connected in series in a circuit, the value of current:

(1) Increases                                         (2) becomes half   

(3) decreases                                        (4) remains the same                             (4)

9. Which of the following acids is present in Red Ants?

(1)  Malic acid       (2) Formic acid      (3) Tannic acid      (4) Oxalic acid       (2)

10. Negative acceleration is in the opposite direction of:

(1) force                 (2) distance            (3) velocity            (4) momentum       (3)

11. Which gas is released when water is added to bleaching powder?

(1)  Oxygen           (2) Hydrogen          (3) Carbon dioxide     (4) Chlorine      (4)

12. Which of the following is essential for the synthesis of thyroxin?

(1) Potassium         (2) Calcium           (3) Iodine               (4) Sodium             (3)

13. Which of the following serves as a nutritive tissue for the growing embryo?

(1)  Ovule              (2) Zygote              (3) Ovary               (4) Endosperm       (4)

14. The main cause of rancidity in foods is the _______of fats and oils.

(1)  hydrolysis       (2) clarification      (3) reduction          (4) oxidation          (4)

15. To convert temperature from Celsius to Kelvin scale, you must:

(1)  subtract 273 from the given temperature   

(2) multiply the given temperature by 273    

(3)  add 273 to the given temperature    

(4) divide the given temperature by 273                                                            (3)

16. Metals reacts with acids to give:

(1) A salt and Chlorine                         (2) A salt and Hydrogen     

(3) A salt and water                              (4) A salt and base                                (2)

17. Which of the following metals is stored in kerosene oil?

(1) Copper             (2) Sodium             (3) Platinum           (4) Gold                 (2)

18. Which of the following gases is not generated in a biogas plant?

(1) H2S                  (2) CO2                   (3) CH4                  (4) CO                    (4)

19. If you look into a mirror and find that the image (your reflexion) is smaller than you, then the type of the mirror is:

(1) concave mirror                                (2) convex mirror   

(3) plane-concave mirror                     (4) plane mirror                                    (2)

20. Chlorine gas is used in the manufacture of:

(1) Baking powder                               (2) Bleaching powder     

(3) Baking soda                                    (4) Washing soda                                  (2)

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