To project the rockets which of the following principle(s) is/are required?
a.
Newton's third law of motion
b.
Newton's law of gravitation
c.
Law of conservation of linear momentum
d.
Both (a) and (c)
Correct Answer
Step-by-Step AI Explanation
Verified Method
A rocket works on the principles of Newton’s third law of motion and the law of conservation of linear momentum. When hot gases are expelled backward from the rocket, an equal and opposite reaction pushes the rocket forward. Hence, both (a) and (c) are correct. Newton’s law of gravitation is not the principle used for propulsion.
Q2mcq
SI unit of resistance is __________.
a.
Mho
b.
Joule
c.
Ohm
Correct Answer
d.
Watt
Step-by-Step AI Explanation
Verified Method
The SI unit of resistance is ohm ($\Omega$). Mho is the unit of conductance, joule is the unit of energy, and watt is the unit of power.
Q3mcq
Sound waves travel in air with a speed of about __________ at NTP.
a.
$340\times10^8$ m/s
b.
340 m/s
Correct Answer
c.
$3\times10^8$ m/s
d.
$3\times10^{-8}$ m/s
Step-by-Step AI Explanation
Verified Method
The speed of sound in air at NTP is about 340 m/s. The other values are not correct because they are either far too large or far too small compared to the actual speed of sound.
Q4mcq
Unit of radioactivity is __________.
a.
Roentgen
b.
Curie
c.
Becquerel
d.
All of the above
Correct Answer
Step-by-Step AI Explanation
Verified Method
Radioactivity is measured in different units depending on the context. Roentgen is used for exposure, Curie and Becquerel are units of radioactivity, so the correct option is all of the above.
Q5mcq
Alloy used in the manufacturing of pressure cooker is __________.
a.
Brass
b.
Bronze
c.
Magnalium
d.
Duralumin
Correct Answer
Step-by-Step AI Explanation
Verified Method
Duralumin is the alloy commonly used in the manufacturing of pressure cookers because it is light, strong, and corrosion resistant. Brass and bronze are not commonly used for this purpose, and magnalium is used in specific applications but not typically for pressure cookers.
Q6mcq
The IUPAC name of an organic compound is 3-methyl butan-1-ol. What type of compound it is?
a.
Aldehyde
b.
Carboxylic Acid
c.
Ketone
d.
Alcohol
Correct Answer
Step-by-Step AI Explanation
Verified Method
3-methyl butan-1-ol is an alcohol because its name ends with the suffix '-ol', which indicates the presence of a hydroxyl ($-OH$) functional group. It is neither an aldehyde, carboxylic acid, nor ketone.
Q7mcq
The concept of blood group is derived by __________.
a.
Wiener
b.
Karl Landsteiner
Correct Answer
c.
William Harvey
d.
His
Step-by-Step AI Explanation
Verified Method
The concept of blood groups was discovered by Karl Landsteiner. He identified the ABO blood group system. Wiener is associated with Rh factor, William Harvey discovered blood circulation, and 'His' is not related to blood group discovery.
Q8mcq
Syngamy results in the formation of __________.
a.
Zoospores
b.
Conidia
c.
Zygote
Correct Answer
d.
Chlamydospores
Step-by-Step AI Explanation
Verified Method
Syngamy is the fusion of male and female gametes. This fusion results in the formation of a zygote. Zoospores, conidia, and chlamydospores are asexual reproductive structures, not products of syngamy.
Q9mcq
The large elongated cells that provide nutrition to developing sperms are __________.
a.
Primary germ cells
b.
Sertoli cells
Correct Answer
c.
Leydig cells
d.
Spermatogonia
Step-by-Step AI Explanation
Verified Method
Sertoli cells are the large elongated cells in the seminiferous tubules that nourish and support the developing sperms. Primary germ cells and spermatogonia are involved in sperm formation, while Leydig cells secrete testosterone.
Q10mcq
Life originates from pre-existing life was showed by:
a.
Louis Pasteur
Correct Answer
b.
Oparin
c.
Haldane
d.
Lamarck
Step-by-Step AI Explanation
Verified Method
Louis Pasteur showed that life originates from pre-existing life by disproving spontaneous generation through his swan-neck flask experiment. Oparin and Haldane proposed the chemical evolution theory, and Lamarck proposed the theory of inheritance of acquired characters.
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