NEETshala
Log in Get Started Free

NEET Practice Questions (MCQs) with Answers & Solutions

Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology
Register free to filter questions
● ● ● ● ●

Consider a system of two charges $7 \text{ mC}$ and $-2 \text{ mC}$ placed at $(-9 \text{ cm}, 0, 0)$ and $(9 \text{ cm}, 0, 0)$ respectively. What will be the sign of the electrostatic potential energy of this system?

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

The two charges are $7 \text{ mC}$ (positive) and $-2 \text{ mC}$ (negative). Since they are unlike charges, their product $q_1q_2 < 0$. According to the NCERT material, 'For unlike charges ($q_1q_2 < 0$), the electrostatic force is attractive... so the potential energy is negative.'

● ● ● ● ●

Which of the following forces are considered conservative, allowing for the definition of potential energy?

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

The NCERT states, 'Forces of this kind are called conservative forces. Spring force and gravitational force are examples of conservative forces.' It also mentions that 'Coulomb force between two (stationary) charges is also a conservative force.'

● ● ● ● ●

What is the relationship between the work done by an external force against a conservative force and the potential energy of a system?

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

As stated in the 'INTRODUCTION' section, 'When an external force does work in taking a body from a point to another against a force like spring force or gravitational force, that work gets stored as potential energy of the body.'

● ● ● ● ●

The total work done in assembling a configuration of charges is equivalent to the system's:

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

The NCERT text defines, 'Potential energy of the system = the total work done in assembling the configuration.' (Equation 2.29 and point 6 in summary)

● ● ● ● ●

If a charge $q_1$ is at $r_1$ and another charge $q_2$ is brought from infinity to $r_2$ in an external field $V(r)$, the work done in bringing $q_2$ will include:

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

According to Eq. (2.28), 'Work done in bringing $q_2$ to $r_2$ is $q_2V(r_2) + \frac{1}{4\pi\epsilon_0}\frac{q_1q_2}{r_{12}}$'. This accounts for work against both the external field and the field of $q_1$.

● ● ● ● ●

Which of the following segments of the nephron is characterized by simple cuboidal brush border epithelium, significantly increasing its surface area for reabsorption?

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

According to NCERT, 'Proximal Convoluted Tubule (PCT): PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption.'

● ● ● ● ●

Nearly 70-80 percent of electrolytes and water are reabsorbed in which part of the nephron?

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

The NCERT states, 'Nearly all of the essential nutrients, and 70-80 per cent of electrolytes and water are reabsorbed by this segment (PCT).'

● ● ● ● ●

Which segment of the renal tubule plays a significant role in maintaining the pH and ionic balance of body fluids by selective secretion of hydrogen ions and ammonia into the filtrate, and absorption of HCO$_3^-$?

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

The NCERT text mentions, 'PCT also helps to maintain the pH and ionic balance of the body fluids by selective secretion of hydrogen ions and ammonia into the filtrate and by absorption of HCO$_3^-$ from it.'

● ● ● ● ●

The descending limb of the loop of Henle is permeable to _______ but almost impermeable to _______. This concentrates the filtrate as it moves down.

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

As per NCERT, 'The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes. This concentrates the filtrate as it moves down.'

● ● ● ● ●

Which part of Henle's loop is impermeable to water but allows transport of electrolytes actively or passively, leading to dilution of the concentrated filtrate as it moves upward?

You've reached today's free limit of 20 questions. Log in to keep practising for free.
Explanation

The NCERT states, 'The ascending limb is impermeable to water but allows transport of electrolytes actively or passively. Therefore, as the concentrated filtrate pass upward, it gets diluted due to the passage of electrolytes to the medullary fluid.'

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.