General Science - Online Test
Q1. Single step large mutation is called
Answer : Option A
Explaination / Solution:
Evolution for Darwin was gradual while deVries believed mutation caused speciation. The single large mutation is called saltation.
Q2. Specimens are preserved in the containers or jars in preservative solutions in
Answer : Option A
Explaination / Solution:
Specimens are preserved in the containers or jars in preservative solutions in museum.
Q3. A mother of one year old daughter wanted to space between her children. The best contraceptive method she should use is
Answer : Option B
Explaination / Solution:
Copper-T is a contraceptive method under intra uterine contraceptive device which prevents the implantation and reduce the motility of sperm. It is implanted inside the uterus and works up to five years. So, it is the best method for spacing between two children.
Q4. Two parallel plate capacitors of capacitances C and 2C are connected in parallel and charged to a potential difference V by a battery. The battery is then disconnected and the space between the plates of capacitor C is completely filled with a material of dielectric constant K = 3. The potential difference across the capacitors now becomes
Answer : Option D
Explaination / Solution:
The charges on the capacitors after being charged to a potential V are.After being filled with a material of dielectric K=3 the capacitor which initially had a capacitance C has now the capacitance KC=3C. The common potential
Q5. The sequence of structural gene in lac operon concept is
Answer : Option A
Explaination / Solution:
In lac operon concept the sequence of arrangement of structural gene is as lac Z, lac Y and lac A. The z gene codes for beta-galactosidase. The y gene code for permease and a gene encodes a transacytylase.
Q6. A human female is born with a million of primary oocytes at the time of birth. How many eggs get a chance to mature?
Answer : Option B
Explaination / Solution:
Girls are born with 200-300 millions of primary oocytes but all of these oocytes do not get chance to mature and change into ovum because one ovary produce only one ovum each month in the middle of menstrual cycle. So, about 500 eggs are released by female during her reproductive life.
Q7. Deforestation does not lead to
Answer : Option A
Explaination / Solution:
Deforestation does not lead to quick nutrient cycling but it may leads to soil erosion, alteration of local weather conditions and destruction of natural habitat of wild animals.
Q8. Among the following which is the strongest oxidizing agent?
Answer : Option D
Explaination / Solution:
Because of its highest electronegativity it (F2) is very strongest oxidizing agent.
Q9.
Arrange stages in a statistical investigation
(a) Collection of data
( (b) Analysis of data
( (c) Presentation of data
( (d) Organization of data
( (e) Interpretation of data.
(Options are
(a) Collection of data
( (b) Analysis of data
( (c) Presentation of data
( (d) Organization of data
( (e) Interpretation of data.
(Options are
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. A disk of radius a/4 having a uniformly distributed charge 6C is placed in the x-y plane with its centre at (−a/2, 0, 0). A rod of length a carrying a uniformly distributed charge 8C is placed on the x-axis from x = a/4 to x = 5a/4. Two point charges −7C and 3C are placed at (a/4, −a/4, 0) and (−3a/4, 3a/4, 0), respectively. Consider a cubical surface formed by six surfaces . The electric flux through this cubical surface is
Answer : Option C
Explaination / Solution:
Electric flux through a surface is given by Where q= net charge enclosed inside the surface Since half the disc lies inside the surface and one fourth of rod lies inside the surface, point charge lies inside the surface and point charge 3C lies outside the surface So the net charge enclosed by the surface is So
