General Science - Online Test
Q1. A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc × AaBbCc, the phenotypic ratio of the offspring was observed as 1 : 6 : x : 20 : x : 6 : 1. What is the possible value of x?
Answer : Option B
Explaination / Solution:
Polygenic trait controlled by three genes will form 8 types of gametes. Combination of 8 types of gametes of male and female each result into 64 types of zygote in different ratio. So, possible value of x is 15 (1:6:15:20:15:6:1).
Q2. A nitrogen fixing microbe associated with Azolla in rice fields is
Answer : Option A
Explaination / Solution:
A number of microbes are present in rice field, Azolla and Anabaena are two common bacteria found in rice field that fix the atmospheric nitrogen.
Q3. A parallel plate capacitor made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad . rms value of the conduction current is
Answer : Option C
Explaination / Solution:
No Explaination.
Q4. In the systemic circulation, blood vessel that carries blood from the intestine to liver is named :
Answer : Option C
Explaination / Solution:
The hepatic portal vein carries blood from intestine to the liver before it is delivered to the systemic circulation.
Q5. The TCA cycle starts with
Answer : Option D
Explaination / Solution:
The TCA cycle starts with the condensation of acetyl group with oxaloacetic acid (OAA) and water to yield citric acid.
Q6. Octet of electrons, represents a particularly stable electronic arrangement. Atoms achieve the stable octet when they are linked by chemical bonds. This rule is associated with one of the following theories
Answer : Option D
Explaination / Solution:
G.N.Lewis, proposed the octet rule to explain the valence electron sharing between atoms that resulted in a bonding type with the atoms attaining noble gas electronic configuration.
The statement is : "a bond is formed between two atoms by mutual sharing of pairs of electrons to attain a stable outer-octet of electrons for each atom involved in bonding". This type of valence electron sharing between atoms is termed as covalent bonding.
Q7. Given magnetic field B, area A and length l of a solenoid. The magnetic energy per unit volume is
Answer : Option C
Explaination / Solution:
U=12μ0B2Al
UV=B22μ0
Q8. DDT is a
Answer : Option C
Explaination / Solution:
DDT is a non-biodegradable pollutant used as pesticides in agricultural field. It pollutes the air, water and soil if used in form of spray.
Q9. The work function for aluminium surface is 4.2 eV. The cutoff wavelength for the photo electric effect for the surface is
Answer : Option B
Explaination / Solution:
ϕ0=hcλ04.2×1.6×10−19=6.6×10−34×3×108λ0λ0=6.6×10−34×3×1084.2×1.6×10−19=2.946×10−7=2946A∘
Q10. Necessary conditions for any system to be aromatic:
Answer : Option D
Explaination / Solution:
Aromaticity condition involves huckel rule (4n+2) Pie electrons. And proper delocalization of pie electron.
