Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
Hydrogenation of vegetable oils using nickel catalyst is an example of
Substitution reaction.
Elimination reaction.
Addition reaction.
Free-radical polymerization.
Light waves are incident on an air-glass boundary, Same of the light waves are reflected and some are refracted in the glass. Which one of the following properties is the same for the incident wave and the refracted wave?
Speed
Direction
Brightness
Frequency
Which one of the following statements about dihydrogen (H2) is not correct?
H2 is lighter than air and insoluble in water.
H2 is inert at room temperature due to high H—H bond dissociation enthalpy.
H2 reacts with alkali metals at high temperature to yield metal hydrides.
A mixture of NO2 and H2 is known as Syngas.
If a ray of light enters from a rarer medium to a denser medium,at zero angles of incidence it would ?
reflect.
Go straight
turn towards the right.
bend at 450
Which of the following pairs of physical phenomenon and the discoverer is/are correctly matched?
1) James Chadwick: Photoelectric effect
2) Albert Einstein : Neutron
3) Marie Curie: Radium
Select the correct answer using the code given below
1, 2 and 3
1 and 2 only
2 and 3 only
3 only
