If the radius of curvature of a spherical convex mirror is 32 cm, what is its focal length?
Physics
Question · Easy
A beam of light travels from vacuum into a glass slab with a refractive index of 1.5. If the speed of light in vacuum is 3 × 10^8 m/s, what is the speed of light in the glass?
Question · Medium
According to Ohm's Law, what is the correct mathematical relationship between potential difference (V), electric current (I), and resistance (R)?
Three resistors of 2 Ω, 3 Ω, and 5 Ω are connected in series. What is the equivalent resistance of the combination?
Three identical resistors, each of resistance 6 Ω, are connected in parallel. What is the equivalent resistance of this parallel combination?
According to Joule's Law of Heating, what is the formula for the heat (H) produced in a resistor of resistance R when a current I flows through it for time t?
What is the direction of magnetic field lines outside a bar magnet?
Which of the following describes the phenomenon of electromagnetic induction?
Question · Hard
In Fleming's Left-Hand Rule, what parameter is represented by the thumb when the forefinger points along the magnetic field and the middle finger points along the current?
In Fleming's Right-Hand Rule, which finger represents the direction of the induced current in the conductor?
Which type of lens is used to correct the eye defect known as myopia (short-sightedness)?
Which type of lens is used to correct the eye defect known as hypermetropia (far-sightedness)?
When white light passes through a glass prism, which constituent color deviates (bends) the most?
The blue color of the sky is primarily a result of which optical phenomenon?
A diverging lens has a focal length of 50 cm. What is the power of this lens?
What is the standard lens formula relating focal length (f), image distance (v), and object distance (u)?
What is the mirror formula relating focal length (f), image distance (v), and object distance (u) for a spherical mirror?
Electric power (P) consumed by a device can be expressed in terms of potential difference (V) and current (I) as which of the following?
What is the SI unit of electric power?
The commercial unit of electrical energy is the kilowatt-hour (kWh). How many Joules are equivalent to 1 kWh?
Which of the following characteristics is essential for the wire used in an electric safety fuse?
What is the nature of the magnetic field inside a long, straight solenoid carrying a steady electric current?
What is the standard frequency of the alternating current (AC) power supplied to households in India?
What is the principal chemical component of biogas (which makes it an excellent fuel)?
By which primary process is energy generated in commercial nuclear power plants?
To operate an Ocean Thermal Energy Conversion (OTEC) power plant, what minimum temperature difference is required between the warm surface water and cold deep water?
Which semiconductor element is most commonly used in the manufacture of commercial solar cells?
An object is placed at a distance of 2F (twice the focal length) in front of a convex lens. What are the properties and position of the image formed?
What are the two necessary conditions for the phenomenon of Total Internal Reflection (TIR) to occur?
A swimming pool appears shallower than it actually is. Which formula correctly relates the refractive index (n) of water to its real depth and apparent depth?
In domestic electrical wiring circuits, how are various electrical appliances connected relative to each other?
According to the Indian Standard code for electrical installations, what color is used for the live wire in modern household wiring?
What is the primary function of the earth wire in a domestic electrical circuit?
According to the Right-Hand Thumb Rule, what does the direction of the thumb represent when finding the magnetic field around a straight conductor?
The balancing of a chemical equation is based on which of the following fundamental laws?
Chemistry
What type of chemical reaction is the rusting of iron?
When calcium carbonate (limestone) is heated, it decomposes to yield calcium oxide (quicklime) and carbon dioxide gas. What specific class of decomposition reaction is this?
Why is biological respiration classified as an exothermic process?
Consider the redox reaction: CuO + H2 → Cu + H2O. Which substance acts as the reducing agent (is oxidized)?
Litmus solution, a common acid-base indicator, is a purple dye extracted from which group of plants?
At 25 °C, what is the pH value of a completely neutral aqueous solution?
Which of the following is the approximate pH of human gastric juice (stomach acid) during digestion?
What is Milk of Magnesia chemically, and what is its primary medical application?
What is the correct chemical formula of Plaster of Paris?
What is the common name and chemical formula of sodium hydrogencarbonate?
What is the correct chemical formula of washing soda?
Bleaching powder is manufactured by reacting chlorine gas with which of the following substances?
Which of the following metals is liquid at room temperature?
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