General Science - Online Test
Q1. Study of human population is called as
Answer : Option A
Explaination / Solution:
The study of human population in a particular area is called demography. It includes the population density, number of male and female individuals and age group of population.
Q2. Which of the following is a component of Net factor income from abroad is
Answer : Option D
Explaination / Solution:
No Explaination.
Q3. The major contribution of S.N. Bose was in
Answer : Option D
Explaination / Solution:
Satyendra Nath Bose was an Indian physicist from Bengal specialising in theoretical physics. He is best known for his work on quantum mechanics in the early 1920s, providing the foundation for Bose–Einstein statistics and the theory of the Bose–Einstein condensate.
Q4. To make a condenser of 16 μF, 1000 volts, how many condensers are needed which have written on them “8 μF, 250 volts”?
Answer : Option D
Explaination / Solution:
Each capacitor of capacitance can withstand a maximum potential of 250 V. When equal capacitors are connected in series, the potential difference across them is equal. If there are m capacitors in series such that the potential across each is 250 V, then,. The equivalent capacitance of 4 capacitors connected in series is.To achieve a capacitance of 16 , n such rows of capacitors need to be connected in parallel. .To make a condenser of 16,8 rows of capacitors with each row containing 4 capacitors are to be connected. The total number of capacitors= n×m=4×8=32.
Q5.
How many atoms of Oxygen are there in 18g of water?
(Hint: Avagadro’s Number
= 6.02 x atoms/mol)
Answer : Option C
Explaination / Solution:
The problem is based upon the concepts of Avogadro's law
.Accordingly , one mole (ie 18 g ) of water contains
= 6.02 x molecules of water
. Again , since the number of oxygen atoms in one molecule of water ( H2 O )
= 1 atom
the number of oxygen atoms in 6.02 x 1023 molecules of water
.= 6.02 x 1023 atoms
Q6. At the saturation point of commodity X, the MUx is?
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. A spherical solid ball of 1 kg. mass and radius 3 cm is rotating about an axis passing through its centre with an angular velocity of 50 radians/s. The kinetic energy of rotation is
Answer : Option D
Explaination / Solution:
M=1KgR=3cm=3×10−2mω=50rad/sK=12Iω2=12×25MR2×ω2K=12×25×1×(3×10−2)2×50×50=920J
Q8. Soap helps in better cleansing of clothes because
Answer : Option B
Explaination / Solution:
Water molecules have a tendency to stick together, as opposed to losing their fellow water molecules’ company and sticking to other surfaces. This happens as a result of something known as the ‘surface tension’ of water.
Surfactants are substances that help lower the surface tension of water molecules, thus ‘persuading’ them to wet things more uniformly.
Soaps (which are a type of detergent) contain surfactants in significant amounts, which help water spread uniformly over clothes.
Q9. Which one of the following is correct pairing of a body part and muscle fibre that moves it?
Answer : Option C
Explaination / Solution:
The iris contains involuntary smooth muscles. It encircles the pupil of the iris and helps to dilate the pupil when there is insufficient light for the normal function of the eye.
Q10. In which class of fungi the mushroom belongs to
Answer : Option D
Explaination / Solution:
The mushroom belongs to class Basidiomyces to kingdom fungi. Basidiomycetes produce basidiospores as reproductive units. The member of this group grows on dead and decaying matters.
