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Home/class 12

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Hriday Saini
Poll
Hriday Saini
Asked: April 1, 2025In: Class 12 Physics

A long solenoid carrying current produces a magnetic field B along its axis. If the number of turns in the solenoid is halved and current in it is doubled the new magnetic field will be :

The correct answer is (B) B. The magnetic field inside a solenoid is given by B = μ0nI, where n is the number of turns per unit length. Halving turns and doubling current keeps nI constant, so the field remains ...

chapter 4 moving charges and magnetismclass 12mcqphysics
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Sanjay01 Kumar
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Sanjay01 Kumar
Asked: March 25, 2025In: Class 12 Physics

A Student measures the terminal potential difference (v) of a cell ( of emf ɛ and internal resistance r) as a fuction of current (I) flowing through it. the slope and the intercept, of the graph between V and I, than respectively, equal

Ans. The terminal voltage equation is V = ɛ – Ir, comparing with y = mx + c, the slope is -r and the intercept is ɛ. Thus, the correct answer is (a) -r and ɛ.

chapter 3class 12mcqphysics
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Sanjay01 Kumar
Poll
Sanjay01 Kumar
Asked: March 25, 2025In: Class 12 Physics

If two bulbs of wattage 25 W and 100 W respecti-vely each rated at 220 V connected in series with the supply of 440 V, which bulb will fuse?

Resistance of a bulb is R = V²/P . For 25 W: R₁ = 220²/25 = 1936Ω and for 100 W: R₂ = 220²/100 = 484Ω. Total resistance Rtotal = 1936 + 484 = 2420Ω. Current I = 440/2420 ...

class 12mcqphysics
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Ganpati
Ganpati
Asked: February 26, 2024In: Class 12 Chemistry

How do sex hormones, testosterone, estradiol, and progesterone, contribute to secondary sex characteristics and reproductive processes?

Testosterone is responsible for secondary male characteristics, estradiol for secondary female characteristics and menstrual cycle control, and progesterone prepares the uterus for the implantation of a fertilized egg.

chapter 10chemistryclass 12
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Ganpati
Ganpati
Asked: February 26, 2024In: Class 12 Chemistry

Explain the consequences of malfunctioning adrenal cortex, mentioning a specific disease.

Malfunctioning adrenal cortex, as seen in Addison’s disease, leads to hypoglycemia, weakness, and increased stress susceptibility. Treatment involves glucocorticoids and mineralocorticoids.

chapter 10chemistryclass 12
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