General Science - Online Test
Q1. Which of the following metal solution cannot be prepared by Bredig’s arc method?
Answer : Option D
Explaination / Solution:
Potassium due to very high reactivity, canot be used here.
Q2. Four point charges qA=2μC,qB=−5μC,qC=2μC,andqD=−5μC are located at the corners of a square ABCD of side 10 cm. Force on a charge of 1μC placed at the centre of the square is
Answer : Option C
Explaination / Solution:
EB-ED=0 and so the net electric field at centre=0 so force on charge 1µC=0
EB-ED=0 and so the net electric field at centre=0 so force on charge 1µC=0
Q3. A circular steel wire 2.00 m long must stretch no more than 0.25 cm when a tensile force of 400 N is applied to each end of the wire. What minimum diameter is required for the wire?
Answer : Option B
Explaination / Solution:
No Explaination.
Q4. DNA fragments move at different distances in Gel Electrophoresis because
Answer : Option C
Explaination / Solution:
Gel electrophoresis is a technique used to separate DNA fragments (or other macromolecules, such as RNA and proteins) based on their size and charge. Electrophoresis involves running a current through a gel containing the molecules of interest. Based on their size and charge, the molecules will travel through the gel in different directions or at different speeds, allowing them to be separated from one another.
During gel electrophoresis different fragments move at different distances due to difference in their molecular weight of the fragments. Smaller fragments move more towards anode.
Q5.
Read the following :
i. Avian kidneys have very short loops of Henle.
ii. Birds are unable to make urine as hypotonic as mammals can.
Answer : Option A
Explaination / Solution:
Avian kidneys have very short loops of Henle’s. Loops of Henle’s used in concentration of urine. Birds make urine highly hypotonic.
Q6. An electric heater supplies heat to a system at a rate of 100W. If the system performs work at the rate of 75 joules per second, at what rate is the internal energy increasing?
Answer : Option C
Explaination / Solution:
ΔQ=ΔU+WΔU=100−75=25Watt
Q7. Assertion: Coacervates are believed to be the precursors of life.
Reason: Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.
Reason: Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.
Answer : Option C
Explaination / Solution:
Coacervates are believed to be the precursors of life. These molecules consists protein along with lipids. They are aggregates of proteins surrounded by lipid but self-duplicating ability were not present in them.
Q8.
A student forgot to add the reaction mixture to the round bottomed flask at 27 but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477 . What fraction of air would have been expelled out?
Answer : Option A
Explaination / Solution:
n1/n2=T2/T1 =0.4 so fraction of air expelled out =1-0.6=0.4.
Q9. Adenosine is.
Answer : Option A
Explaination / Solution:
Adenosine is nucleoside.
Q10. Some automobiles in the United States are fueled by natural gas. What is the primary environmental advantage of natural gas relative to gasoline as a transportation fuel?
Answer : Option B
Explaination / Solution:
No Explaination.
