General Science - Online Test
Q1. A capacitor of capacitance C is fully charged by a 200 V supply. It is then discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat and of mass 0.1 kg. If the temperature of the block rises by 0.4 K, what is the value of C?
Answer : Option B
Explaination / Solution:
Energy stored in the capacitor This is released as heat when the capacitor discharges through the metal block. The quantity of heat = mass ×s p.heat× rise in temperature.
Q2. Gel electrophoresis is used for
Answer : Option B
Explaination / Solution:
Gel electrophoresis is used to separate macromolecules like DNA, RNA and proteins. DNA fragments are separated according to their size. Proteins can be separated according to their size and their charge (different proteins have different charges).
This is an important tool to study the genome of an individual.
Q3. The …….. is the sexual intercourse between male and female sex.
Answer : Option D
Explaination / Solution:
Transfer of male gametes (sperm) into female genital tract occurs during sexual intercourse that may leads to fertilisation of ovum for pregnancy. Sexual intercourse is called as coition or coitus.
Q4. White fumes appear around the bottle of anhydrous aluminium chloride.Why?
Answer : Option C
Explaination / Solution:
White fumes appears because of formation of HCl on reaction with atmospheric moisture.
White fumes appears due to the formation of HCl gas. Anhydrous aluminium chloride is partly hydrolyzed by the moisture in the atmosphere and produces HCl gas. This HCl further combines with the moisture of the air and appears white fumes.
AlCl3 +3H2O --> Al(OH)3 +3HCl
Q5. The activity which is related to the use of scar resources
Answer : Option D
Explaination / Solution:
No Explaination.
Q6. Which of the following is not true for a region with uniform electric field?
Answer : Option B
Explaination / Solution:
In each of the cases given the electric field is not uniform.
Q7. Grow slower in new habitat is
Answer : Option D
Explaination / Solution:
Variation due to mutation or variation due to recombination during gametogenesis results in changed frequency of genes and alleles in future generation which results into stabilization and directional change in which more individual acquire mean character value.
Q8. Natural method of contraception works on the principle of
Answer : Option B
Explaination / Solution:
Natural method of contraception works on the principles of avoiding meeting of ovum and sperm for fertilisation. Ovum is released in the middle of menstrual cycle, avoiding sex during that interval is necessary in this method.
Q9. The capacitance of a parallel plate capacitor is 5 μF. When a glass slab of thickness equal to the separation between the plates is introduced between the plates, the potential difference reduces to 1/8 of the original value. The dielectric constant of glass is
Answer : Option A
Explaination / Solution:
When a dielectric of constant K is introduced between the plates of a capacitor, the potential V reduces to V/K. Therefore K=8
Q10. Which chromosome of human genome contains least number of genes?
Answer : Option A
Explaination / Solution:
There are 23 pairs of chromosome in human cells. The chromosome Y is the smallest and contain least number of gene (231) and chromosome 1 contain highest number of gene (2968).
