Blog 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

● ● ● ● ●

In a transistor, a change of 8.0 mA in the emitter current produces a change of 7.8 mA in the collector current. What change in the base current is necessaryto produce the same change in the collector current ?

A. $ 300 \mu A$ B. $ 400 \mu A$ C. $ 200 \mu A$ D. $ 100 \mu A$

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

Explanation

$ \alpha = { \triangle I_C \over \triangle I_B }$ , $ \beta = { \alpha \over 1- \alpha } ,$ $ \beta = {\triangle I_C \over \triangle I_B }$

● ● ● ● ●

In a transistor amplifier, $ \beta = 62 , R_L = 5000 \Omega $ and internal resistance of the transistor is $500 \Omega $. What will be the ratio of power amplification to voltage amplification ?

A. 61 B. 62 C. 60 D. 100

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

Explanation

Voltage amplification $ A_v = { BR_L \over R_c } \Rightarrow A_p = { B^2 R_L \over R_C} $

● ● ● ● ●

The current gain of a transistor in common base mode is 0.99. To change the emitter current by 5 mA. What will be the necessary change in collector current ?

A. 5.1 mA B. 4.95mA C. 2.45mA D. 0.196 mA

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

Explanation

$ { \triangle I_C \over \triangle I_E } = \alpha $ ,

● ● ● ● ●

In a common base amplifire circuit, calculate the change inbasecurrent if that in the collector current is 2mA and $ \alpha = 0.98 $

A. 980mA B. 2mA C. 0.04mA D. 1.96mA

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

Explanation

$ \beta = { \alpha \over 1 - \alpha } $

● ● ● ● ●

The current gain of a transistor is 100. If the base current changes by $200 \eta A$ , What is the change in collector current ?

A. 20mA B. 200mA C. 2mA D. 0.2mA

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

Explanation

$ \triangle I_C = \beta \times I_b $

● ● ● ● ●

Which of the following the correct relationship between two current gains $\alpha $ and $ \beta $ in a transistor ?

A. $ \beta = { 1 + \alpha \over \alpha } $ B. $ \beta = { \alpha \over 1 + \alpha }$ C. $ \beta = { 1 + \beta \over \beta } $ D. $ \beta = { \beta \over 1 + \beta }$

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

Explanation

$ \beta = { \alpha \over 1 - \alpha } $

● ● ● ● ●

What is the relation of the transistor current ?

A. $ I_B = I_C +I_E $ B. $ I_C = I_E +I_B $ C. $ I_E = I_C +I_B $ D. $ I_C = I_E +I_B $

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

Explanation

Knowledge base

● ● ● ● ●

Column A (1) If pointer moves when voltage is applied in one way and does not move when reversed and there is no light emission (2) If pointer moves when voltage is applied in one way and does not move when reverse and there is light emission (3) If pointer moves when voltage is applied in one way and also when reversed (4) If pointer does not move when voltage is applied in one way and also when reversed Column B (a) a LED (b) a capacitor (c) a diode (d) a resistor (e) a transistor

A. 1 --> a, 2--> d , 3 --> e, 4 -->c B. 1 --> b, 2--> c , 3 --> d, 4 -->a C. 1 --> c, 2--> a , 3 --> d, 4 -->b D. 1 --> d, 2--> b , 3 --> a, 4 -->d

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

Explanation

If the pointer moves when voltage is applied in one way and does not move when reversed, it indicates a diode (c) because diodes allow current to flow in one direction only. 2. If the pointer moves when the voltage is applied in one way and does not move when reversed but there is light emission, it indicates an LED (a) because LEDs are diodes that emit light. 3. If the pointer moves when voltage is applied in both directions, it indicates a resistor (d) because resistors allow current flow in both directions. 4. If the pointer does not move in either direction, it indicates a capacitor (b) when tested with a DC supply, as capacitors block DC after charging.

● ● ● ● ●

The gravitational force Fg between two objects does not depend on

A. sum of the masses B. product of masses C. Gravitational constant D. Distance between the masses

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

Explanation

The gravitational force \( F_g \) between two objects is given by the formula \( F_g = G \frac{m_1 m_2}{r^2} \), where \( G \) is the gravitational constant, \( m_1 \) and \( m_2 \) are the masses of the objects, and \( r \) is the distance between them. The force depends on the product of the masses, not their sum. Therefore, the correct option is 'sum of the masses'.

● ● ● ● ●

Two sphere of mass $m_1$ and $m_2$ are situated in air and the gravitational force between them is F. The space around the masses is now filled with liquid of specific gravity 3. The gravitational force will now be

A. F B. 3F C. F/3 D. F/9

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

Explanation

Gravitational force does not depend upon the medium

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.