The magnification of a convex lens can be either positive or negative. It is positive when the image formed is virtual and erect, and negative when the image is real and inverted. So the correct answer is (c).
Q2mcq1 mark
In which of the following reaction, the mass number decreases by four of the daughter nucleus?
a.
$\alpha$ decay
Correct Answer
b.
$\beta$ decay
c.
$\gamma$ decay
d.
neutron decay
Step-by-Step AI Explanation
Verified Method
In $Ξ±$ decay, the nucleus emits an alpha particle, which consists of 2 protons and 2 neutrons. Therefore, the mass number of the daughter nucleus decreases by 4. Hence, the correct answer is (a).
Q3mcq1 mark
The gram molecular mass of water is:
a.
2 g
b.
16 g
c.
18 g
Correct Answer
d.
8 g
Step-by-Step AI Explanation
Verified Method
The gram molecular mass of water is the molecular mass expressed in grams. For water, $H_2O = 2(1) + 16 = 18$. Therefore, the gram molecular mass of water is 18 g. So the correct answer is (c).
Q4mcq1 mark
Which of the following is the universal solvent?
a.
Acetone
b.
Benzene
c.
Water
Correct Answer
d.
Alcohol
Step-by-Step AI Explanation
Verified Method
Water is called the universal solvent because it dissolves a large number of substances compared with other liquids. Hence, the correct answer is (c).
Q5mcq1 mark
The secondary suffix used in IUPAC nomenclature of an aldehyde is __________.
a.
-ol
b.
-oic acid
c.
-al
Correct Answer
d.
-one
Step-by-Step AI Explanation
Verified Method
In IUPAC nomenclature, the secondary suffix for an aldehyde is $-al$. Therefore, the correct answer is (c).
Q6mcq1 mark
The heart of amphibians possess __________ chambers.
a.
3
Correct Answer
b.
4
c.
2
d.
5
Step-by-Step AI Explanation
Verified Method
The heart of amphibians has three chambers: two atria and one ventricle. So the correct answer is (a).
Q7mcq1 mark
Krebβs cycle takes place in __________.
a.
chloroplast
b.
mitochondrial matrix
Correct Answer
c.
stomata
d.
inner mitochondrial membrane
Step-by-Step AI Explanation
Verified Method
Krebs cycle takes place in the mitochondrial matrix, where the enzymes required for the cycle are present. Therefore, the correct answer is (b).
Q8mcq1 mark
Bipolar neurons are found in:
a.
retina of eye
Correct Answer
b.
cerebral cortex
c.
embryo
d.
respiratory epithelium
Step-by-Step AI Explanation
Verified Method
Bipolar neurons are found in the retina of the eye. They connect photoreceptor cells to ganglion cells. Hence, the correct answer is (a).
Q9mcq1 mark
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, and it results in the formation of a zygote. Zoospores, conidia, and chlamydospores are asexual reproductive structures, so they are not formed by syngamy.
Q10mcq1 mark
Match the following:
(1) Sarcoma
(2) Carcinoma
(3) Polydipsia
(4) Polyphagia
(a)Calculate the pH of 0.01 M solution of HNO3.
(b)A solution is prepared by dissolving 25 g sugar in 100 g of water. Calculate the mass percentage of solute.
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(a)(i)State Jouleβs Law of Heating.
(ii)An alloy of nickel and chromium is used as the heatin g element. Why ?
(iii)How does a fuse wire protect electrical appliances ?
OR
(b)(i)What is a longitudinal wave ?
(ii)What is a nuclear reactor ? Explain its essential p arts with their functions.
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(a)(i)Define : Atomicity.
(ii)Calculate the percentage of sulphur in H2SO4.
(iii)In what way hygroscopic substances differ from deliquescent substances.
OR
(b)(i)Differentiate reversible and irreversible reaction.
(ii)What is neutralization reaction ? Give an example.
(iii)Give any three characteristics of homologous series.
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(a)(i)Which hormone induces parthenocarpy in tomatoes ?
(ii)Why is thyroid hormone referred as βpersonality hormoneβ ?
(iii)Explain Lamarckβs theories of evolution.
OR
(b)(i)Which enzyme cuts DNA at specific sites ?
(ii)Name two maize hybrids rich in amino-acid, lysi
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