Which of the following is/are not correct about isotopes of an element? The have
the same neutron number
the same proton number
same number of electrons
same chemical properties
different physical poperties.
Correct answer is A
No explanation has been provided for this answer.
farad
henry
hertz
ampere
coulomb
Correct answer is B
No explanation has been provided for this answer.
Which of the following explains the concave meniscus of water in a glass tube?
The adhesion between water and glas is greater than the cohesion between water molecules
The cohesion between water molecule is greater than the adhesion between glass and water
The molecules of water in the glass are moving faster than the molecules in the other parts
The molecules of water at the water-air boundary are often attracted to the center of the tube
The weight of the water pulls the central part of the surface down
Correct answer is A
No explanation has been provided for this answer.
Water is suitable solvent for sugar
The sugar and the water have become single solution
The volume of water molecule does not change when sugar dissolves.
Sugar molecule is small than that of water
Water molecules are separated by large spaces between them
Correct answer is E
No explanation has been provided for this answer.
Which of the following particles of ray has the highest penetrating power?
Beta particles
Alpha particles
Gamma particles
Electrons
Neutrons
Correct answer is C
No explanation has been provided for this answer.