How PNP-transistor works as a switch? The current flows from the base in a PNP transistor. The base terminal is always negatively biased with... View Article
Which ion is paramagnetic in nature? Paramagnetic is a magnetic state of an atom with one or more unpaired electrons. These unpaired electrons... View Article
Why does an object balance at its centre of mass? The balancing of the object depends on the mass of the object. In physics, the centre of mass... View Article
Does a pendulum accelerate? No, the acceleration of a pendulum is zero. The bob of the pendulum swings back and forth but the pendulum as a whole... View Article
Is a horseshoe magnet stronger than a bar magnet? Yes, horseshoe magnets are stronger than the bar magnet because of its shape. The poles of a... View Article
Why do dry cells not last forever? Dry cells carry a fixed amount of reacting chemicals. Once the chemicals in the battery are exhausted the... View Article
What are the signs of a bad battery? A few signs of bad battery in a car are Headlights go dim When the key is turned in the ignition a... View Article
What is less dense water? The density of water is maximum at 3.98oC and has the least density at 0oC. When water freezes at 0oC, hydrogen-bonded... View Article
Why there is no backward wavefront? Energy flows from higher potential to lower potential. Similarly, the wave is a flow of energy through... View Article
What is a wave barrier? When the speed of the source is equal to the speed of the wave, a barrier wave is formed in front of the source as each... View Article
What is the significance of Fresnel Kirchhoff diffraction formula? It is used to calculate the pattern of diffraction when the waves pass through... View Article
Why is ionization dangerous? When the dose of the ionization is extremely high it can cause two types of harm to humans. It can cause tissue... View Article
What is reduced pressure in thermodynamics? The reduced pressure thermodynamics is defined as the ratio of the actual pressure of the system to... View Article
We are familiar with the term absolute zero. Absolute temperature is equal to -273.15 degrees and this is the lowest temperature that is achieved... View Article
What frequency is used to measure bridges? A metre bridge is used to measure a frequency range of 100 Hz to 100 kHz. The accuracy of a metre... View Article
Does any metal float? All metals can float in water if they are made into the right shape or size. For example, a boat. A boat or a metal floats... View Article
(cos p – 1) x2 + (cos p)x + sin p = 0 This is of the form ax2 + bx + c = 0, a = (cos p - 1), b = cos p, c = sin p The condition for real roots... View Article
Solution: (2) sin x – 3 sin 2x + sin 3x = cos x – 3 cos 2x + cos 3x (sin x + sin 3x) - 3 sin 2x = (cos x + cos 3x) - 3 cos 2x 2 sin 2x cos x... View Article
Solution: (3) Given, sin x + cos x = 1 Multiplying and dividing LHS by √2, √2[(sin x/√2) + (cos x/√2)] = 1 sin x sin π/4 + cos x cos π/4 =... View Article
