General Science - Online Test
Q1. A lens forms a sharp image on a screen. On inserting a parallel sided glass slab between the lens and the screen, it is found necessary to move the screen a distance d away from the lens in order to focus the image sharply. If the refractive index of glass relative to air is μ, the thickness of the glass slab is given by
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. Consider the elements: Cs, Ne, I and F. Identify the element(s) that exhibits only Positive oxidation state
Answer : Option C
Explaination / Solution:
Cs is alkali metal so will show positive oxidation state of +1.
Q3. Assertion: Mast cells in the human body release excessive amounts of inflammatory chemicals, which cause allergic reactions.
Reason: Allergens in the environment on reaching human body stimulate mast cells in certain individuals.
Reason: Allergens in the environment on reaching human body stimulate mast cells in certain individuals.
Answer : Option C
Explaination / Solution:
The IgE-primed mast cell releases granules and powerful chemical mediators, such as histamine, cytokines, granulocyte macrophage colony-stimulating factor (GM-CSF), leukotrienes, heparin, and many proteases into the environment. These chemical mediators cause the characteristic symptoms of allergy.
Q4. The unit cell of a substance has cations A+ at the corners of the unit cell and the anions B – in the center. The simplest formul of the substance is
Answer : Option D
Explaination / Solution:
Contribution of A= Contribution of B = 1. Formula is AB.
Q5. Normative economics analyses
Answer : Option B
Explaination / Solution:
Normative economics is a part of economics that expresses value or normative judgments about economic fairness or what the outcome of the economy or goals of public policy ought to be.
Q6. The relative tendency of an atom in a molecule to attract the shared pair of electrons towards itself is termed as its
Answer : Option D
Explaination / Solution:
A qualitative measure of the ability of an atom in a chemical compound to attract shared electrons to itself is called electronegativity. Unlike ionization enthalpy and electron gain enthalpy, it is not a measureable quantity. However, a number of numerical scales of electronegativity of elements viz., Pauling scale, Mulliken-Jaffe scale, Allred-Rochow scale have been developed. The electronegativity of any given element is not constant; it varies depending on the element to which it is bound.
Q7. What happens to TR when MR is zero
Answer : Option A
Explaination / Solution:
No Explaination.
Q8. Holes in the ozone layer are thought to have been caused by:
Answer : Option A
Explaination / Solution:
CFC’s causes hole in the ozone layer.
Q9. An ideal gas occupies a volume of 100 at C and 100 Pa. Find the number of moles of gas in the container.
Answer : Option C
Explaination / Solution:
number of moles according to gas equation
Q10.
Give the number of electrons in the species, and .
Answer : Option C
Explaination / Solution:
atomic number O has atomic number = 8 so number of electrons in = 16
while in there is one unit positive charge so no. of electron =15.
