SRMJEE Mock Test - 9 (Medical) - JEE MCQ

Since, the frequency n of the light does not change as light travels from air into glass, we have
v_a = nλ_a and v_g = nλ​​​​​​​_g
Therefore,

The wavelength emitted is given by:

The longest wavelength in the Balmer series will correspond to the transition from n = 3 to n = 2.

The charging battery is removed. Therefore, q = constant
The distance between the plates is increased. Therefore, C decreases.
Now, V = q/C, q is constant and C is decreasing.
Therefore, V should increase.
U = again q is constant and C is decreasing.
Therefore U should increase.

Ampere is the unit of current, so we can write it as Q/t
Hour is the unit of time, so we can write it as t.
Ampere-hour is = Q. Hence, ampere-hour is the unit of electric charge.

Stopping potential (V₀) is the minimum negative (retarding) potential given to the anode for which the photoelectric current becomes zero when the stopping potential equals the maximum kinetic energy (K_max) of the photoelectrons. That is,
K_max = eV₀    ... (i)
Now, de-Broglie wavelength of electron is given by

Equating Eqs. (i) and (ii), we arrive at

⇒ 

he motional emf induced in a conductor is:

e = Bvl

Therefore, induced current is:

i = Bvl/R

Force on current carrying conductor, due to magnetic field is,

Therefore, force required to move the rod with constant velocity is,

The resistance of a conductor is given as,

R = ρlA

Where l is the length measured along the direction of the current.

A is the area of cross-section measured perpendicular to the direction of the current.

The cross-sectional area of the A−A face is,
2x × 4x = 8x²

The resistance between A−A (top and bottom face) is,

The cross-sectional area of the B−B face is,
x × 4x = 4x²

The resistance between B−B is,

The cross-sectional area of the C−C face is,
x × 2x = 2x²

The resistance between C−C is,

From the above three relations, it is clear that the maximum electrical resistance is,
R_c−c

Let the oxidation number of Cu be ‘a’ , then
a + 4 × 0 = +2
Hence, a = +2

Biodegradable polymers are a special class of polymer that breaks down after its intended purpose by bacterial decomposition process to result in natural by products such as gases, water, biomass, and inorganic salts
Poly β-hydroxybutyrate – co-β-hydroxy valerate (PHBV) is a biodegradable polymer, It is obtained by the condensation polymerisation of 3-hydroxybutanoic acid and 3 - hydroxypentanoic acid.  PHBV undergoes bacterial degradation in the environment.

This problem involves conceptual mixing of preparation of styrene and addition polymerisation of styrene. Students are advised to follow these steps.

• Complete the reaction first using information provided in question. (use elimination reaction)
• Then, using the product of above reaction as starting material identify the correct product.

Preparation of styrene

Styrene is obtained due to elimination reaction of 1-chloro-2 phenyl ethane in presence of strong base KO But
Polymerisation of styrene

• A virus is a small collection of genetic code, either DNA or RNA, surrounded by a protein coat. A virus cannot replicate alone. Viruses must infect cells and use components of the host cell to make copies of themselves.
• All viruses are nucleoproteins (Nucleic acid + Protein) in the structure. The nucleic acid (DNA and RNA) is the genetic material.
• In a particular virus, either DNA or RNA is genetic material never both are present in a virus.
• Single-stranded RNA or ssRNA - Tobacco mosaic virus (TMV) Virus envelope is known as capsid. The capsid is composed of protein subunits called capsomeres.

Hence, the correct option is A

NCERT Reference: Page no. 26 of topic “2.6 VIRUSES, VIROIDS, PRIONS AND LICHENS” of chapter 2 of NCERT

Coelenterates have radial symmetry. Aschelminth are pseudocoelomates. Molluscs do not show metamerit Sponges are diploblastic.

The vascular bundles are collateral and closed type in the monocot leaves and each one is surrounded by a bundle sheath which is a layer of thin-walled parenchymatous cells. So, the correct answer is ‘Mesophyll is not differentiated into palisade and spongy parenchyma.

Angiogram is an X-ray diagnostic procedure used to visualize the blood vessels following injection of a contrast 16 substance into an artery. Coronary angiography is used to
detect obstruction in the coronary arteries, due to presence of atherosclerotic plaques which can lead to heart attack, To clear the passage, a very small balloon tipped catheter is inserted into the coronary artery under X-ray observation, Then the balloon is inflated with air to destroy the plaques, thereby clearing the lumen of the blood vessel for blood flow, This procedure is known as coronary artery angioplasty.

There is a sequential, orderly pathway functioning, with one substrate forming the next and with glycolysis, TCA cycle and ETS pathway following one after another.

Topic in NCERT: Glycolysis, TCA cycle and ETS pathway

Line in NCERT: "There is a sequential, orderly pathway functioning, with one substrate forming the next and with glycolysis, TCA cycle and ETS pathway following one after another."

The correct option is:

2. Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1

Explanation:

- Statement 1 is correct: Brood parasitism in birds involves a parasitic bird laying its eggs in the nest of a host bird, and the host bird then incubates these eggs.

- Statement 2 is correct: During the course of evolution, the eggs of parasitic birds have evolved to resemble the host's eggs in size and color. This adaptation reduces the chances of the host bird detecting the foreign eggs and removing them from the nest.

Therefore, statement 2 provides the correct explanation for statement 1.

Topic in NCERT: Parasitism

Line in NCERT: "Brood parasitism in birds is a fascinating example of parasitism in which the parasitic bird lays its eggs in the nest of its host and lets the host incubate them. During the course of evolution, the eggs of the parasitic bird have evolved to resemble the host's egg in size and colour to reduce the chances of the host detecting the foreign eggs and ejecting them from the nest."

The electrical potential difference across the resting plasma membrane is called as the resting potential.The rise in the stimulus-induced permeability to Na+ is extremely shortlived. It is quickly followed by a rise in permeability to K+. Within a fraction of a second, K+ diffuses outside the membrane and restores the resting potential of the membrane at the site of excitation and the fibre becomes once more responsive to further stimulation.

Line in NCERT: "The rise in the stimulus-induced permeability to Na* is extremely short-lived. It is quickly followed by a rise in permeability to K*. Within a fraction of a second, K+ diffuses outside the membrane and restores the resting potential of the membrane at the site of excitation and the fibre becomes once more responsive to further stimulation."

- The Assertion (A) is true because ethidium bromide binds to DNA and is necessary for visualization during gel electrophoresis.

- The Reason (R) is false because ethidium bromide requires UV radiation to visualize DNA; it does not make DNA visible under normal light conditions.

- Therefore, the Reason is not the correct explanation of the Assertion, as the Assertion is true but the Reason is false.

A- Lactobacillus B- Trichoderma polysporum C-Yeast D-Penicillin

• Mycorrhiza is a symbiotic association between fungus and angiosperms.
• The most common fungal partners of mycorrhiza are the Glomus species.

Hence, the correct option is D.
NCERT Reference: Topic- MICROBES AS BIOFERTILISERS” of chapter "Microbes in Human Welfare" of NCERT.  

Topic in NCERT: Microbes as biofertilisers

Line in NCERT: "many members of the genus glomus form mycorrhiza."

Glycocalyx (mucilage sheath) is the outermost layer of the bacterial cell envelope which consists of non-cellulosic polysacharides with or without proteins. It may occur in the form of loose sheath, called slime layer. If it is a thick coering, it is called capsule. Glycocalyx gives sticky character to the cell and is not absolutely essential for survival of bacteria. It prevents desiccation, protects from phagocytes, toxic chemicals and viruses and serves in attachment. It may give selective advantage though in certain situations.

Line in NCERT: "Glycocalyx differs in composition and thickness among different bacteria. It could be a loose sheath called the slime layer in some, while in others it may be thick and tough, called the capsule."

Out arrows are representing person facing outside and in arrows representing person facing inwards.

The person sitting between L and Z in anticlockwise direction with respect to Z. Anticlockwise direction is opposite to clockwise.

Therefore, Four persons are sitting between L and Z- W, Y, S, X.

Punna was a slave and she was a hardworking (industrious) girl. She always used to work till late night. The answer can be inferred from 'I myself have to be up late because I am poor and have to work hard' stated in the passage.
'Lively' and 'animated' mean full of life or excitement. 'Dormant' means temporarily inactive or inoperative. 'Lethargic' also means lazy.

'Pounding' means 'repeated and heavy striking'. 'Beating', in context of the passage, means to stir (cooking ingredients) vigorously to make a smooth or frothy mixture. None of the other terms are used in relation to food items. Thus, at the midnight Punna just finished pounding (beating into a smooth mixture) rice for the next day's meal.