General Science - Online Test
Q1. Liquid – liquid solutions are known as
Answer : Option D
Explaination / Solution:
Dispersed phase and dispersion medium both are liquids.
Q2. Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the box is . (a) What is the net charge inside the box? (b) If the net outward flux through the surface of the box were zero, could you conclude that there were no charges inside the box?
Answer : Option C
Explaination / Solution:
(a) Net outward flux through the surface of the box, ϕ = 8.0 × N /C For a body containing net charge q, flux is given by the relation, = Permittivity of free space = 8.854 × N^{−1} We have q = ϕ = 8.854 × × 8.0 × = 7.08 × = 0.07 μC Therefore, the net charge inside the box is 0.07 μC. (b) No Net flux piercing out through a body depends on the net charge contained in the body. If net flux is zero, then it can be inferred that net charge inside the body is zero. The body may have equal amount of positive and negative charges.
Q3. A copper cube measures 6.00 cm on each side. The bottom face is held in place by very strong glue to a flat horizontal surface, while a horizontal force F is applied to the upper face parallel to one of the edges. How large must F be to cause the cube to deform by 0.250 mm? (shear modulus of copper = 4.4 Pa)
Answer : Option A
Explaination / Solution:
No Explaination.
Q4. Stanley Cohen and Herbert Boyer worked on which bacteria?
Answer : Option D
Explaination / Solution:
Stanley Cohen and Herbert Boyer worked on bacterium Salmonella typhimuriumin 1972 by isolating the antibiotic resistance gene by cutting out a piece of DNA from a plasmid which was responsible for conferring antibiotic resistance.
Q5. Match the kidney disorders and its symptoms :
column A
a) Ketosis
b) Polydipsia
c) Alkaptonuria
d) Haematuria
column B
i) frequent thirst
ii) blood in urine
iii) acetoacetic acid in urine
iv) homogentisic acid in urine
column A
a) Ketosis
b) Polydipsia
c) Alkaptonuria
d) Haematuria
column B
i) frequent thirst
ii) blood in urine
iii) acetoacetic acid in urine
iv) homogentisic acid in urine
Answer : Option C
Explaination / Solution:
Ketosis is the presence of actoacetic acid in urine, polydipsia is the condition of frequent thrist, alkaptonuria is the presence of homogentisic acid in urine and haematuria is the presence of blood in urine.
Q6.
A 1.0-kg bar of copper is heated at atmospheric pressure. If its temperature increases from 20C to 50C, what is the work done by the copper on the surrounding atmosphere? Given that for Cu = 5.1 x 10-5 / C,
Answer : Option D
Explaination / Solution:
ΔV=3αViΔT=5.1×10−5×30×Vi=1.5×10−3ViΔV=1.5×10−3mρCu=1.5×10−318.92×103=1.7×10−7W=PΔV=1.01×105×1.7×10−7=1.7×10−2J
Q7. According to Neo-Darwinism, natural selection operates through
Answer : Option C
Explaination / Solution:
According to Neo-Darwinism, natural selection operates through differential reproduction. During sexual reproduction gametes are formed by meiosis division in which crossing over brings about change in traits that leads to variation for natural selection.
Q8. Calculate the volume occupied by 8.8 g of CO2 at 31.1 and 1 bar pressure. R = 0.083 bar .
Answer : Option B
Explaination / Solution:
V=wRTMPV=8.8×0.083×304.144×1=5.05L
Q9. Two nucleic acid chains are wound about each other and held together by hydrogen bonds between pairs of bases is called
Answer : Option D
Explaination / Solution:
Secondary structures are hydrogen pairs of bases.
Q10. This refers to the atmospheric disturbance and recurrent ocean warming.
Answer : Option A
Explaination / Solution:
No Explaination.
