X-rays are produced when a stream of electrons in an X-ray tube _____.

1. 1. hits the glass wall of the tube
   2. pass through a strong magnetic field
   3. strikes metal target
   4. None of the above

Which groups of elements in the periodic table shows highest first ionisation potential?

1. 1. Elements in the left hand top corner
   2. Elements in the left hand bottom corner
   3. Elements in the right hand top corner
   4. Elements in the right hand bottom corner

In the periodic table, elements have been arranged in order of _____.

1. 1. increasing volume
   2. increasing atomic number
   3. increasing atomic weights
   4. increasing density

When we move from left to right in second period in the periodic table, the atomic volume of the elements _____.

1. 1. increases
   2. decreases
   3. increases with constant state
   4. None of the above

Generally in a given period in the periodic table, as we move from left to right, the electropositive character of elements _____.

1. 1. increases
   2. decreases the then increases
   3. decreases
   4. neither increases nor decreases

When two ice cubes are pressed over each other, they unite to form one cube. Which of the following force is responsible for holding them together?

1. 1. Hydrogen bond formation
   2. Vander Walls forces
   3. Covalent attraction
   4. Dipole dipole attraction

The cooling caused by the expansion of a compressed gas below its inversion temperature without doing external work is called _____.

1. 1. Compton effect
   2. Faraday Tyndall effect
   3. Adiabatic diamagnetism
   4. Joule Thomson effect

Mendeleev’s periodic table is upset by the fact that _____.

1. 1. Noble gases do not form compounds
   2. Many elements have several isotopes
   3. Atomic weight of elements are not always whole numbers
   4. Some groups stand divided into two subgroups A and B

Stainless steel does not rust because _____.

1. 1. Nickel present in it does not rust
   2. Iron forms a hard chemical compound with chromium present in it
   3. Chromium and nickel combine with iron
   4. Chromium forms an oxide layer that protects iron from rusting

Milk lacks in one important nutrient namely _____.

1. 1. Iron
   2. Protein
   3. Calcium
   4. Potassium