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
Which of the following characteristics is common to hydrogen, nitrogen, oxygen and carbon dioxide?
They are all diatomic
They are all gases at room temperature.
They are all coloured.
They all have same reactivity.
The compound C7H7NO2 has ?
17 atoms in a molecule of the compound
equal molecules of C and H by mass
twice the mass of oxygen atoms compared to nitrogen atoms
twice the mass of nitrogen atoms compared to hydrogen atoms
A particle moves with uniform acceleration along a straight line from rest. The percentage increase in displacement during sixth second compared to that in fifth second is about ?
11 %
22 %
33 %
44 %
Two persons are holding a rope of negligible mass horizontally. A 20 kg mass is attached to the rope at the midpoint; as a result the rope deviates from the horizontal direction. The tension required to completely straighten the rope is (g=10m/s2)
200 N
20 N
10 N
infinitely large
Which one of the following does not convert electrical energy into light energy?
A candle
A light-emitting diode
A laser
A television set
