Practice Test - NEET MCQ

According to kinetic theory of gases there is no intermolecular force of attraction between the molecule of gases but its not true as gases liquifise, at high pressure molecular interaction starts due to which pressure on the walls decreases as molecule dragged back so pressure exerted by real gas is less than ideal gas, due to repulsive forces molecule behave as small spheres and hence volume decreases

In case of ideal gases the average velocity is always zero. Hence the average momentum is zero. 
Whereas average speed is non- zero so the kinetic energy is also non-zero,  as these two are scalar quantities.

1 mole = 6.02 x 10²³

Adding heat energy to water increases the motion of the water molecules and the molecules of food coloring. The faster moving molecules cause the food coloring to mix into the water faster. The water molecules and food coloring molecules in cold water don't move as quickly as in hot water.

The net flow of solute is from its higher concentration to lower concentration.

This process is called nuclear fusion. It is found in the sun. Nuclear fission is a reaction in which two small nuclei combine together to form a big nuclei and release energy. This type of reaction takes place in sun and is the reason behind the massive amount of energy it sun provides.

As we move along the period electronegativity increases due to increase in nuclear charge.

so clearly N₃H has the highest oxidation state

Fe (OH)₃ is used to remove arsenic impurities.

F₂ is very strong oxidizing agent.

BF₃ reacts with LiAlH₄ to form B₂H₆ which reacts with NH₃NH₃ in 1:2 ratio forming B₃N₃H₆( Borazine , inorganic benzene

in B only  is losing its proton therefore act as acid.

The correct answer is option D
The reaction of chlorine gas with hot and concentrated sodium hydroxide solution is
3Cl_2​ + 6NaOH⟶NaClO_3​+ 5NaCl+3H₂​O
Oxidation number of Cl is 0 in Cl_2​, −1 in NaCl and +5 in NaClO₃​
So the oxidation number of chlorine changes from Zero to -1 and Zero to +5.
 

Assertion (A) is true because apomixis is an asexual process that results in seed formation without fertilization.

Reason (R) is false because apomictic plants do produce seeds despite the lack of fertilization.                                                                                      So option (A) is True but (R) is False is correct .

(A) To determine the correctness of the statements regarding the given diagram:

- Statement I: The pollen tube enters a synergid under guidance from A, which is correct.
- Statement II: Male gametes are discharged into a synergid, which is correct

Statement I is correct, Statement II is correct SO OPTION (A)
 

PEN (primary endosperm nucleus) divides into two nuclei and subsequent division of nucleus produce large number of nucleus without cell wall formation. These types of endosperm are called free nuclear type of endosperm.

Double fertilisation involves fusion of one male gamete with egg during Syngamy and fusion of two polar nuclei with other male gametes. So, total 5 nuclei are involved in double fertilisation.

The flower in which pollen grain is transferred from anther to stigma of anther flower by insects are colorful to attract insects and contain nectar.

The correct option is A Epicotyl
Plumule- Shoot tip.

Radicle - Embryonic root.

A. Epicotyl- The portion of axis between the plumule and the cotyledonary node.

B. Hypocotyl- The portion of axis between the radicle and the cotyledonary node.

D. Coleoptile- Protective sheath of plumule.

So, the correct answer is 'Epicotyl'

• Seminal plasma is the fluid part of semen and is contributed by seminal vesicles, prostate gland and bulbourethral glands. Seminal vesicles contribute fructose, citric acid and other nutrients as well as fibrinogen and prostaglandin.
• Secretions from prostate gland contain calcium ions, phosphate Ion, etc. and are alkaline in nature.
• Bulbourethral glands secrete alkaline mucus which is important for the lubrication of penis.

Hence, the Correct Answer is C

• The testes are situated outside the abdominal cavity within a pouch called scrotum.
• The scrotum helps in maintaining the low temperature of the testes (2-2.5°C lower than the normal internal body temperature) necessary for spermatogenesis.

Hence, the Correct Answer is B

• Each testicular lobule contains one to three highly coiled seminiferous tubules in which sperms are produced.
• Each seminiferous tubule is lined on its inside by two types of cells called male germ cells (spermatogonia) and Sertoli cells.
• The male germ cells undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells.

Hence, the Correct Answer is D

Periodic abstinence is one such method in which the couples avoid or abstain from coitus from day 10 to 17 of the menstrual cycle when ovulation could be expected.

Diaphragms ain't spermicidal Because it doesn't kill the sperms instead prevents sperm entry as they are to be placed in the cervical region as a barrier / cover .

To analyze the statements provided, we will evaluate each one separately.

Step 1: Evaluate Statement I
Statement I: Oral Contraceptive pills are a safeguard against AIDS and sexual diseases besides checking pregnancy.

- Oral contraceptive pills (OCPs) are designed to prevent pregnancy by inhibiting ovulation and altering the uterine lining.
- They do not provide protection against sexually transmitted infections (STIs) or HIV/AIDS.
- Therefore, this statement is incorrect.

Step 2: Evaluate Statement II
Statement II: Copper-T is a physical barrier preventing the body fluid of two partners to come in contact.

- Copper-T is an intrauterine device (IUD) that is used for contraception.
- It works by preventing fertilization and does not act as a physical barrier to prevent body fluids from coming into contact, as it is placed inside the uterus.
- Physical barriers that prevent body fluids from mixing include condoms and diaphragms, not Copper-T.
- Therefore, this statement is also incorrect.

Conclusion
Both statements I and II are incorrect.

Intra uterine device (IUD) is a method of contraception in India. The IUD is inserted in the woman’s uterus through the cervix.