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When $n$ resistors, each of resistance $R$, are connected in series, the equivalent resistance is ___. When $n$ resistors, each of resistance $R$, are connected in parallel, their equivalent resistance is ___.

Find equivalent resistance between A & B in the circuit:

A point object is placed at a distance of 10 cm and its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror, the image will shift by about

why is the colour of clear sky blue?

In the figure given below, the ammeter A reads 0.3 A.

Calculate the total resistance of the circuit is.

Why is the "Voltmeter connected parallel to the resistor"? Explain.

What is the power of a convex lens whose focal length is 80 cm ?

Which of the following is not a type of electromagnetic radiation?

How heat and electricity related....... B'cuz anything which conducts heat also conduct electricity......

In order to obtain a magnification of, -2 (minus 2) with a concave mirror, the object should be placed : (a) between pole and focus (b) between focus and centre of curvature (c) at the centre of curvature (d) beyond the centre of curvature

please explain DC motor's working

Five persons A, B, C, D and E have diabetes, leukaemia, asthma, meningitis and hepatitis, respectively.
(a) Which of these persons can donate eyes ?
(b) Which of these persons cannot donate eyes ?

What is the difference between nuclear fission and fusion?

At what height from the surface of earth the total energy of a satellite is equal to its potential energy at a height of 2R from surface of earth ? (R = radius of earth)

An electric fridge of 1000 watt operates 4 hr per day for 30 days. How much is the energy consumed by the fridge in this period?

The moment of a force of 10 N about a fixed point O is 5 Nm. Calculate the distance of the point O from the line of action of the force.

10 moles of an ideal gas expands adiabatically reversibly from 5$d{m}^3$ to 10$d{m}^3$ at 300 K. Find the entropy change.

Explain the electric dipole moment..

There are a bulb and a battery, and a person connects them using a plastic tube. The bulb doesn’t glow. Instead, when he uses a copper wire to connect them, the bulb glows. Which of the following is true?
i) Copper allows current to flow easily
ii) Plastic tube doesn’t allow the current to flow easily
iii) Plastic tube absorbs the current.
iv) Copper wire generates extra current

Q. Name the physical quantity which is (I) same (ii) different ,in all the bulb when three bulbs of :

(A) same wattage are connected in series

(B) same wattage are connected in parallel

(C) different wattage are connected in series

(D) different wattage are connected in parallel

Define Henry’s law.

Two bulbs A & B rated [200V, 50W] and [200V, 100W] are connected in series. Which will glow brighter?

$\text{Calculate the amount of heat required to convert 1.00 kg of ice at -10°C}$
$\text{at normal pressure to steam at 100°C.}$

$\text{The specific heat capacity of ice}=2100Jk{g}^{-1}{K}^{-1}$

$\text{Latent heat of fusion of ice}=3.36\times {10}^{5}Jk{g}^{-1}$

$\text{The specific heat capacity of water}=4200Jk{g}^{-1}{K}^{-1}$

$\text{Latent heat of vaporization of water}=2.25\times {10}^{6}Jkg-1$

Find the refractive index of the liquid from the given figure.

A scooter mechanic can open a nub by applying 120 N force while using a lever of 50 cm in length. How long handle is required if he wishes to open it by applying a force of only 40 N?

Gravitational potential energy of an object will:

A wire has a diameter of 0.5 mm and a resistivity of 1.6 × ${10}^{-6}$ ohm cm. How much of this wire would be required to make a 10 ohm coil?

The potential at the surface of a planet of mass M and radius R is assumed to be zero. Choose the most appropriate option

If fuses of 250 mA, 500 mA, 1 A, 5 A and 10 A were availble, which one would be the most suitable for protecting an amplifier rated at 240 V, 180 W ?

A wire is cut into three equal parts and then connected in parallel with the same source.

(a) How will its Resistance and Resistivity get affected?

(b) How would the total current and the current through the parts change?

Consider the situation shown in figure. The horizontal surface below the bigger block is smooth. The coefficient of friction between the blocks is $\mu$. Find the minimum force F that can be applied in order to keep the smaller block at rest with respect to the bigger block

A convex lens forms an image of the same size as the object at a distance of 30 cm from the lens. What is the distance of the object from the lens?

Refraction of light as it enters from one transparent medium to another is due to

Write a short note on the reuse method in the 3 $R^{{}^{\prime }}$s. [2 MARKS]

If you and your friend are standing, will you both see the same rainbow?explain clearly

Which of the following statements is/are true in dispersion?

I: Refractive index for violet colour is maximum

II: Deviation produced for red colour is minimum

III: The wavelength for green colour is greater than that for blue colour

Why does the sun appear red during the sunrise and the sunset?

A student traces the path of a ray of white light through a rectangular glass slab and marks, the angles of incidence $\left(\angle i\right)$refraction $\left(\angle r\right)$ and emergence $\left(\angle e\right)$as shown. Which angle or angles has he not marked correctly?

State two differences between an electromagnet and a permanent magnet.

Where should an object be placed in front of a convex lens of focal length 0.12 m to obtain a real image of size three times the size of the object, on the screen ?