Revision DPP - 14-Jan-25

1.

Which of the following represents $X$ as the major product of the given reaction?
$\mathrm {CH_3-C\equiv~~C-CH_3 }\xrightarrow {\mathrm {NaNH_2}}\mathrm {X};$

1.	$\mathrm {CH_3-CH_2CH_2CH_3}$
2.	$\mathrm {CH_3CH_2C\equiv CH}$
3.
4.	$\mathrm {CH_2= C=CH-CH_3}$

2.

The green alga rich in proteins used as food supplements even by space travelers is
1. Chlorella
2. Scendesmus
3. Porphyra
4. Carrageen

3.

The hard chitinous exoskeleton of cockroach has sclerites which are called as:

Options	Dorsally	Ventrally
(1)	sternites	tergites
(2)	Arthrodial membrane	pleura
(3)	tergites	sternites
(4)	pleura	sternum

4.

Products of light reaction does not include-
a. ATP & NADPH
b. CO2
c. O2
d. Electrons

5.

Which organisms are responsible for the production of biogas?

(1) Archaebacteria
(2) Eubacteria
(3) Mycoplasma
(4) Protists

6.

Parturition involves a positive feedback between:

1.	uterine contraction, estrogen
2.	estrogen, progesterone
3.	estrogen, oxytocin
4.	uterine contraction, oxytocin

7.

The correct IUPAC name of the given compound is:

1. 3-Ethyl-4-ethenylheptane
2. 3-Ethyl-4-propylhex-5-ene
3. 3-(1-Ethyl propyl) hex-1-ene
4. 4-Ethyl-3-propylhex-1-ene

8.

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow-seeded plant is crossed with a green-seeded plant, what ratio of yellow and green-seeded plants would you expect in F1generation?
1. 50:50
2. 9:1
3. 1:3
4. 3:1

9.

A network of four capacitors of capacity equal to $C_{1} = C, C_{2} = 2 C, C_{3} = 3 C and C_{4} = 4 C$ are connected to a battery as shown in the figure. The ratio of the charges on capacitor $C_{1} a n d C_{4}$ is -

1. $\frac{22}{3}$
2. $\frac{3}{22}$
3. $\frac{7}{4}$
4. $\frac{4}{7}$

10.

Which of the following is not a part of female external
genitalia?
1. Birth canal
2. Hymen
3. Clitoris
4. Labia minora

11. Agaricus, Ustilago and Puccinia belong to the class:
1. Phycomycetes
2. Ascomycetes
3. Basidiomycetes
4. Deuteromycetes

12.

All of the following statements are correct except:
(1) The proximal end of the filament is attached to the thalamus or the petal of the flower.
(2) The anther is a four-sided structure consisting of four microsporangia, two in each lobe.
(3) The number and length of stamens are variable in flowers of different species.
(4) In a longitudinal section, a typical microsporangium appears near circular in outline.

13.

A point charge is placed at the center of the spherical Gaussian surface. The electric flux through the surface is changed if the:

1.	sphere is replaced by a cube of the same volume.
2.	sphere is replaced by a cube of half volume.
3.	charge is moved off-centre in the original sphere.
4.	charge is moved just outside the original sphere.

14.

For depositing 1 g of an element in a voltameter, 3 A current for 4 minutes is required. To deposit the same mass, a current of 8 A will be required for:
1. 1 minute
2. 2 minute
3. 1.5 minute
4. 3 minute

15.

The IUPAC name of the compound
${CH}_{3} - \underset{OH}{\underset{|}{CH}} - COOH$
1. 2 – Hydroxypropionic acid
2. 2 – Hydroxy Propanoic acid
3. Propan – 2– ol –1 – oic acid
4. 1 – Carboxyethanol.

16.

The number of contrasting characters studied by Mendel for his experiments was:

1.	14	2.	4
3.	2	4.	7

17.

Which of the following is a free radical substitution reaction?
1. Benzene with Br₂/AlCl₃
2. Acetylene with HBr
3. Methane with Br₂/hv
4. Propene with HBr/(C₆H₅COO)₂

18.

Bougainvillea and Citrus plants are protected from browsing animals as:
1. Adventitious buds get modified into thorns.
2. Axillary buds get modified into spines.
3. Lateral buds get modified into pointed structures.
4. Apical buds get modified into thorns.

19.

Four identical thin rods each of mass M and length l form a square frame. The moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is:
1.

\frac{4}{3} M l^{2}

2.

\frac{2}{3} M l^{2}

3.

\frac{13}{3} M l^{2}

4.

\frac{1}{3} M l^{2}

20.

Mendel’s work remained unrecognized till 1900. Which of the following was not a reason for this?

1.	His work was widely publicized and it brought bad name to Mendel.
2.	His concept of factors as stable and discrete units that did not ‘blend’ was not accepted.
3.	His approach of using mathematics to explain biological phenomena was unacceptable.
4.	He could not provide any physical proof for the existence of factors or say what they were made of.

21. Two wires of resistance $R_1$ and $R_2$ have temperature coefficient of resistance ${{\alpha}}_{1} ~\text{and}\;{{\alpha}}_{2}$ respectively. These are joined in series. The effective temperature coefficient of resistance is:

1.	$\dfrac{\left({{{\alpha}}_{1}{+}{{\alpha}}_{2}}\right)}{2}$	2.	$\sqrt{{\mathit{\alpha}}_{1}{\mathit{\alpha}}_{2}}$
3.	$\dfrac{\left({{{\alpha}}_{1}{R}_{1}{+}{{\alpha}}_{2}{R}_{2}}\right)}{{R}_{1}{+}{R}_{2}}$	4.	$\sqrt{\dfrac{{R}_{1}{R}_{2}{{\alpha}}_{1}{{\alpha}}_{2}}{\sqrt{{R}_{1}^{2}{+}{R}_{2}^{2}}}}$

22. Which of the following is not a correct difference between members of Chondrichthyes and Osteichthyes?

	Feature	Chondrichthyes	Osteichthyes
1.	Operculum	Absent	Present
2.	Scales	Placoid	Cycloid/Ctenoid
3.	Swim bladder	Absent	Present
4.	Mouth	Mostly terminal	Located ventrally

23. A positive charge particle of $100$ mg is thrown in opposite direction to a uniform electric field of strength $1\times 10^{5}$ NC^-1. If the charge on the particle is $40$ µC and the initial velocity is $200$ ms^-1, how much distance it will travel before coming to the rest momentarily:
1. $1$ m
2. $5$ m
3. $10$ m
4. $0.5$ m

24. The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of $2~\Omega$. The value of the internal resistance of each cell is:
1. $2~\Omega$
2. $4~\Omega$
3. $6~\Omega$
4. $8~\Omega$

25. If two plants having heterozygous genotype for a trait are crossed, what percentage of the progeny will have heterozygous genotype?
1. 25%
2. 50%
3. 75%
4. 100%

26. Which of the following statements is true for viroids?
1. They infect only plants and consist of double-stranded DNA enclosed by protein coat
2. They infect only animals and consist of single-stranded RNA enclosed by protein coat
3. They infect only animals and consist of double-stranded RNA enclosed by protein coat
4. They infect only plants and consist of single stranded RNA not enclosed by protein coat

27. The effective resistance of a number of identical resistors connected in parallel is $x.$ When one of the resistors is removed, the effective resistance becomes $y.$ What is the resistance of the removed resistor?

1.	$\dfrac{(x/y)}{(x+y)}$	2.	$\dfrac{(xy)}{(y-x)}$
3.	$ (y-x)$	4.	$\sqrt{xy}$

28. A cell has emf of $2.2~\text V$ and its internal resistance is $0.1~\Omega.$ What is the current in the circuit, if the cell is connected across a resistance of $1~\Omega?$
1. $1~\text A $
2. $1.5~\text A $
3. $2.0~\text A $
4. $2.5~\text A $

29. Consider the given statements:

Assertion (A):	Even if a character shows multiple allelism, an individual will only have two alleles for that character.
Reason (R):	The somatic cells of an individual have only two chromosomes.

1.	(A) is True but (R) is False.
2.	Both (A) and (R) are True and (R) correctly explains (A).
3.	Both (A) and (R) are True but (R) does not correctly explain (A).
4.	(A) is False but (R) is True.

30. Consider the given two statements:

I:	Water splitting complex is associated with PSII in photosynthetic plants.
II:	Chlorophyll a reaction center in PSII is called as P680

1. Only I
2. Only II
3. Both I and II are correct
4. Neither I nor II

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1.	\(\mathrm {CH_3-CH_2CH_2CH_3}\)
2.	\(\mathrm {CH_3CH_2C\equiv CH}\)
3.
4.	\(\mathrm {CH_2= C=CH-CH_3}\)

1.	\(\dfrac{\left({{{\alpha}}_{1}{+}{{\alpha}}_{2}}\right)}{2}\)	2.	\(\sqrt{{\mathit{\alpha}}_{1}{\mathit{\alpha}}_{2}}\)
3.	\(\dfrac{\left({{{\alpha}}_{1}{R}_{1}{+}{{\alpha}}_{2}{R}_{2}}\right)}{{R}_{1}{+}{R}_{2}}\)	4.	\(\sqrt{\dfrac{{R}_{1}{R}_{2}{{\alpha}}_{1}{{\alpha}}_{2}}{\sqrt{{R}_{1}^{2}{+}{R}_{2}^{2}}}}\)

1.	\(\dfrac{(x/y)}{(x+y)}\)	2.	\(\dfrac{(xy)}{(y-x)}\)
3.	\( (y-x)\)	4.	\(\sqrt{xy}\)

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