General Science - Online Test
Q1. Among the following the maximum covalent character is shown by the compound
Answer : Option A
Explaination / Solution:
Few ionic bonds have partial covalent characteristics which were first discussed by a scientist, Kazimierz Fajans in 1923. He gave the rule to predict whether a chemical bond will be covalent or ionic which is now commonly known as Fajan’s rule. The rule can be stated as:
- Size of the ion: Smaller the size of cation, larger the size of anion, greater is the covalent character of the ionic bond.
- Charge of Cation: Greater the charge of cation, greater is the covalent character of the ionic bond.
- Electronic configuration- For cations with same charge and size, the one, with (n-1)dnns0 which is found in transition elements have greater covalent character than the cation with ns2np6 electronic configuration, which is commonly found in alkali or alkaline earth metals.
Keeping these rules in mind, we can say that AlCl3 has high covalent character.
Q2. Current in a circuit falls from 5.0 A to 0.0 A in 0.1 s. If an average emf of 200 V induced, estimate of the self-inductance of the circuit is
Answer : Option D
Explaination / Solution:
L=−edi/dt=−200−5/0.1=4H
Q3. Cellular respiration first takes place in
Answer : Option C
Explaination / Solution:
Cellular respiration takes place in two steps- Glycolysis and Kreb’s cycle. Glycolysis occurs in cytoplasm of cells and Kreb’s cycle in mitochondria. So, first step of respiration takes place in cytoplasm.
Q4. The cultivation of a single cash crop in plantations or estates (large areas of land) on a large scale(in the whole year)is called plantational farming and example is/are
Answer : Option B
Explaination / Solution:
Plantation agriculture is a form of commercial farming where crops are grown for sale. Some crops are sold as raw materials to manufacturing industries or partially processed and value added before selling the products to large companies for further processing. Example of plantational farming is rubber plantation, tea plantation etc.
Q5. Dichloromethane (Methylene chloride) is
Answer : Option B
Explaination / Solution:
CHCl2 is organic solvent
Q6. What is diameter of CD-ROM
Answer : Option C
Explaination / Solution:
No Explaination.
Q7.
If an electron is accelerated by 8.8then electric field required for acceleration is (given specific charge of the electron = 1.76)
Answer : Option B
Explaination / Solution:
a=8.8×1014m/s2em=1.76×1011CKg−1a=Fm=eEm=(em)E8.8×1014=1.76×1011×EE=8.8×10141.76×1011=5000Vm−1=50Vcm−1
Q8. Choose the correct order of increase in electopositivity of alkaline earth metals in the options given below
Answer : Option D
Explaination / Solution:
As we move down the group size increases so IE value decreases thus electropositivity also decreases.( shielding effect also decreases as we go down the Group)
Q9. Ground wave propagation is used for
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. The technique that is extensively used to separate mixtures into their components, purify compounds and also to test the purity of compounds is
Answer : Option A
Explaination / Solution:
Chromatography is used to separate mixtures of substances into their components. All forms of chromatography work on the same principle. They all have a stationary phase (a solid, or a liquid supported on a solid) and a mobile phase (a liquid or a gas).
