Isotopes of the same elements has__________________?
A. different number of protons
B. same number of neutrons
C. different number of neutrons
D. same mass number (nucleon number)
When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?
D. are collected at same time
For which of the following compounds the term empirical formula cannot be applied ?
D. It can be applied to all mentioned above
The properties of an element mosly corresponds to that isotope which has greater_________________?
A. Mass number
B. Atomic mass
C. Relative abundance
D. all of the above
Which statement is incorrect for pasteurization?
A. It is used to preserve yogurt and milk
B. It was developed by Louis Pasteur.
C. It involves heating the substance at a high temperature for just a few secs.
D. It can be used to preserve vegetables and meat.
What is the mode of transmission of Hepatitis virus?
B. Parentral (via blood)
C. Skin penetration
Which disease can be controlled by vaccination?
D. Heart attack
Vaccine was first developed by
A. Louis Pasture
B. Edward Jenner
C. Jaber Ibn Hayan
Motorcycle safety helmet extends the time of collision hence decreasing the________________?
A. chance of collision
B. force acting
During long jump, athlete runs before taking the jump. By doing so he__________________?
A. provide him a larger inertia
B. decreases his inertia
C. decreases his momentum
D. increases his momentum
A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?
A. 14 m
B. 20 m
C. 5 m
D. 25 m