NCERT CLASS 10 SCIENCE CHAPTER 12 – MAGNETIC EFFECTS OF ELECTRIC CURRENT IN-TEXT QUESTIONS AND ANSWERS 1. Why does a compass needle get deflected when brought near a bar magnet? A compass needle is a small magnet. When it is brought near a bar magnet, the magnetic field of the bar magnet exerts a force on the compass needle, causing it to deflect. 2. Draw magnetic field lines around a bar magnet. Magnetic field lines around a bar magnet emerge from its North pole and enter its South pole outside the magnet. Inside the magnet, they travel from the South pole to the North pole, forming closed curves. 3. List the properties of magnetic field lines. The properties of magnetic field lines are: Magnetic field lines emerge from the North pole and enter the South pole outside a magnet. Inside the magnet, their direction is from the South pole to the North pole. Magnetic field lines form closed and continuous curves. The tangent at any point on a magnetic field line gives the direction of...

  NCERT CLASS 10 SCIENCE CHAPTER 11 – ELECTRICITY IN-TEXT QUESTIONS AND ANSWERS 1. What is an electric current? Electric current is the rate of flow of electric charge through a conductor. Formula: I = Q/t Where: I = Electric current Q = Electric charge t = Time The SI unit of electric current is ampere (A). 2. Define one ampere of electric current. One ampere is the electric current flowing through a conductor when one coulomb of charge passes through its cross-section in one second. 1 A = 1 C/1 s 3. Calculate the number of electrons constituting one coulomb of charge. Given: Charge, Q = 1 C Charge on one electron, e = 1.6 × 10⁻¹⁹ C Number of electrons = Total charge / Charge of one electron n = 1 / (1.6 × 10⁻¹⁹) n = 6.25 × 10¹⁸ Answer: 6.25 × 10¹⁸ electrons. 4. What is the direction of conventional electric current? Conventional electric current flows from the positive terminal to the negative terminal of a cell through the external circuit. The actual flow of electrons is in the...

  NCERT CLASS 10 SCIENCE CHAPTER 8 – HEREDITY IN-TEXT QUESTIONS AND ANSWERS 1. If a trait is inherited from one parent, what happens to the DNA contribution from the other parent? In sexual reproduction, an offspring receives DNA from both parents. Each parent contributes one set of chromosomes. Therefore, traits inherited from one parent do not mean that the other parent has made no contribution. 2. How does the inheritance of two different traits in pea plants help us understand inheritance? Studying two different traits together helps us understand how traits are passed from parents to offspring. Mendel observed that different pairs of traits can be inherited independently of one another. 3. How do variations arise during reproduction? Variations arise due to small differences during DNA copying. In sexual reproduction, genetic material from two parents combines, producing new combinations of genes. These processes create differences among offspring. 4. Why are variations import...