General Science - Online Test
Q1. A series LCR circuit with R = 20 , L = 1.5 H and C = 35 is connected to a variable-frequency 200 V ac supply. When the frequency of the supply equals the natural frequency of the circuit average power transferred to the circuit in one complete cycle is
Answer : Option D
Explaination / Solution:
When the frequency of the supply equals the natural frequency of the circuit
in this case impedance Z = R
average power
Pav=Vrms×irms×cosϕ=Vrms×VrmsZ×RZZ=RPav=(Vrms)2R=200×20020=2000W
Q2. What are the qualities that a good questionnaire should have
Answer : Option A
Explaination / Solution:
Following are the qualities of a good questionnaire;
- Brief and Limited Questions
- Simple and Clear
- Unambiguous Questions
- No Personal Questions
- Avoidance of Calculations
- Sequence of the Questions
- Pre-testing
- Instructions
- Cross Examination
Q3. The Chipko Movement, which aimed at protecting forest in the
Answer : Option B
Explaination / Solution:
No Explaination.
Q4. Protein synthesis occurs over
Answer : Option B
Explaination / Solution:
Protein synthesis occurs over ribosomes which are also called protein factories of cell. Each ribosomes have two parts 40S and 60S in eukaryotes and 30S and 50S in prokaryotes.
Q5. In the circuit shown below, the galvanometer G will show zero deflection
Answer : Option C
Explaination / Solution:
The ratio of the resistances in the arms is not equal. The wheatstone’s network is not balanced. The galvanometer will continue to show deflection in all cases.
Q6.
The maximum velocity and maximum acceleration of a body moving in a simple harmonic oscillation are 2 m/s and 4 . The angular velocity is
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. The number of moles of solute present in 1 kg of solvent is called--------------.
Answer : Option D
Explaination / Solution:
Molality is defined as no. of moles of solute present per kg of solvent.It is denoted as " m " . Mathematically ,
Molality (m)
= [ number of moles of the solute ] / kg of solvent
Since , this mode of expressing the strength of a solution involves ( weight / weight ) relationship of solute and solvent , the molality of the solution is not affected by variation in temperatures of the solution.
Q8. Water behaves as an amphoteric substance because
Answer : Option A
Explaination / Solution:
An amphoteric compound is a compound that can act either as an acid, or as a base in a chemical reaction.
A first example of water's amphoteric character is the fact that it can self-ionize to a small extent. A water molecule is capable of donating one of its protons (H+) to a neighbouring water molecule, forming the hydroxyde and hydronium ions.
Q9. Norin-10 gene is famous for
Answer : Option B
Explaination / Solution:
Norin-10 gene is used to obtain dwarf varieties of crops like rice and wheat. This gene is introduced in crop plants by using technique of genetic engineering.
Q10. Which of the following phenomenon cannot be explained by diffraction?
Answer : Option A
Explaination / Solution:
No Explaination.
