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Showing posts with label class10-physics. Show all posts
Showing posts with label class10-physics. Show all posts

## Magnetic Effects of Electric Current (Worksheet)

CBSE Class 10 - Physics

Fill in the blanks

1. The space around a magnet in which the force of attraction and repulsion due to the magnet can be detected is called the _____________.

2. Outside a bar magnet, the magnetic field lines tend to start from _______ pole  and reach ________ pole. Thus these field lines form _______ loops.

3. The region where the field lines are close together will have _______ magnetic field.

4. Is magnetic field a vector quantity? (Yes/No)  ## Understanding Spherical Mirrors

Class 10 - Physics - Chapter Light  ## Light (Spherical Mirrors) - Worksheet

Class 10 Physics

Fill in the blanks by opting either 'positive' or 'negative'

1. If an image is formed behind a concave mirror, the image distance (v) is __________.

2. If image is formed in front of a mirror, the image distance (v) is taken as ________.

3. The image distance (v) for concave mirror is considered ________.

4. The focal length of a concave mirror is considered _________.  ## Light - Image Formation By A Plane Mirror

(Q & A Part-3)
CBSE Class 10 - Physics  ## Chapter: Light - Reflection

Class 10 Physics  ## Chapter: Light (Q & A) Part-1Class 10 Physics  ## Electricity

MCQs (Set-2)

Q1: The rate of flow of an electric charge is known as:
(a) electric potential
(b) electric conductance
(c) electric current
(d) none of these

Q2: The SI unit of electric current is:
(a) ohm
(b) ampere
(c) volt

Q3: The instrument used for measuring electric current is:
(a) ammeter
(b) galvanometer
(c) voltmeter
(d) potentiometer  ## CHAPTER-12 ELECTRICITY

Q1: What is represented by joule/coulomb?

Q2: A charge of 2C moves between two plates, maintained at a p.d of 1V. What is the energy acquired by the charge?

Q3: Why are copper wires used as connecting wires?

Answer: The electrical resistivity of copper is low

Q4: A wire of resistivity 10 ohm meter is stretched to double its length. What is its new resistivity?

Answer: It remains same because resistivity depends on nature of material.

Q5: What is the resistance of connecting wire?

Answer: The resistance of a connecting wire, which is made of good conductor, is negligible.  # Physics: Important Discoveries

No. Discovery Scientist Year
1. Proton Rutherford 1919
3. Atom John Dalton 1808
4. Atomic Structure Neil Bohr & Rutherford 1913
7. Raman Effect CV. Raman 1928
8. X-Rays Roentgen 1895
9. Photoelectric effect Albert Einstein 1905
10. Periodic table Mendeleev 1888
11. Nuclear Reactor Anrico Fermi 1942
12. Wireless Telegram Marconi 1901
13. Dynamite Alfred Nobel 1867  ## Class 10 - Physics - 1 Mark Questions Asked in CBSE Examination Papers (Set-1)

Q1: Write the energy conversion that takes place in a hydropower plant.

Answer: Potential Energy ---> Kinetic Energy -----> Electrical Energy

Q2: If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it?

Q3: Which phenomenon is responsible for making the path of light visible?  ## Physics Quiz (1 Word Answer)

Q1: Who firstly demonstrated experimentally the existence of electromagnetic wave?

Q2: The working of the quartz crystal in the watch is based on which effect?

Q3: What is the unit of Radioactivity?

Q4: What is the wavelength of the visible spectrum?

Q5: One astronomical unit is the average distance between___?

Q6: Number of basic S.I. units are ___.

Q7: What is the name of the scientist who stated that matter can be converted into energy?

Q8: The size of the atomic nucleus is of the order of___?

Q9: A temperature at which both the Fahrenheit and the centigrade scales have the same value?  ## Friday, 5 October 2018

### CBSE Class 10 - Science - Chapter 14 - Sources Of Energy - Study Points (#eduvictors)(#cbsenotes)

Class 10 - Science - Chapter 14

## Sources Of Energy

Energy:
Whenever a body is capable of doing work, the body is said to possess energy. Thus energy is defined as the ability of a body to do work and the amount of energy possessed by a body is equal to the amount of work it can do when its energy is released.

Energy comes in different forms and one form can be converted to another. For example, if we drop a plate from a height, the potential energy of the plate is converted mostly to sound energy when it hits the ground.

A good source of energy should be:

i) Safe and convenient to use, e.g., nuclear energy can be used only by highly trained engineers with the help of nuclear power plants. It cannot be used for our household purposed.

ii) Easy to transport, e.g., coal, petrol, diesel, LPG etc. Have to be transported from the places of their production to the consumers.

iii) Easy to store, e.g., huge storage tanks are required to store petrol, diesel, LPG etc.  ## Electricity - Assignment Sheet

Very Short Q & A (1 marks each)

Q1: Define resistivity of material.

Q2: What is the power of torch bulb rated at 2.5V and 500mA?

Q3: Why series arrangement not used for connecting domestic electrical appliances in a circuit?

Q4: Which has higher resistance – a 50W bulb or a 2.5W bulb and how many times?

Q5: What is the direction of flow of conventional current?

Q6: Calculate the amount of charge flowing in a wire if it draws a current of 2A in 10 minutes

Q7: What happens to resistance of a conductor if area of cross-section is doubled?

Q8: Which device helps to maintain a potential difference across a conductor?

Q9: Find the number of electron in 1C of charge.

Q10: Name the physical quantity whose unit is V/A.

Q11: Name the device that helps to maintain a potential a potential difference across a conductor.  ## The Human Eye and the Colourful World – Unit Test Paper

Q1: A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power which type?

Q2: Give reasons for the following:
i. Stars twinkle at night.
ii. The sun appears reddish early in morning.
iii. Planets do not twinkle.
iv. Red colour is used in danger signals.

Q3: A person walking in desert gets a illusion of seeing water. Name the phenomenon of light responsible for it.

Q4: Distinguish between Refraction and Dispersion.  ## Physics - Refraction From Lens

Q1: In refraction of light, what does Snell's Law state?

Answer: The ratio of sine of angle of incidence to the sine of angle of refraction remains constant subject to certain conditions. This is called refraction.

Q2: Which of the following property of light wave changes when it travels from one medium to another (having different optical densities)?

a. Wavelength
b. Speed of Light
c. Frequency  ## What is Total Internal Reflection?

① When a ray of light travels from optically denser medium to optically rarer medium, it bends away from the normal at the surface separating two media.  ## Science – Light, Refraction and Dispersion - Assignment

Q1: What do you mean by refraction of light? In which direction will light bend when travelling from an optically rarer medium to an optically denser medium?

Q2: Name the part of the eye which gives colour to the eyes.

Q3: Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?

Q4: How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?  ## Light and Reflection - Magnification Chart For Mirrors

Q: What is Magnification?

Answer: The ratio of height of image to the height of an object is known as magnification of an image and is denoted as m.

```           Image height         h'     -v
m = -------------------- = ---- = ----
Object height        h       u

```

The +ve value of magnification represents virtual image of an object.

The -ve value of magnification represents real image of an object.

Q: Using magnification formula, prove that image formed by a plane mirror is at the same distance as object but behind the mirror. It is given that in plane mirror, object height and image height are equal.  ## Light - Reflection From Mirrors (Worksheet)

1. We get a diminished image with a concave mirror when the object is placed ____.

2. The drivers mirror used in automobiles is ____.

3. The distance of focus F from the pole P is termed as the ..................... of the mirror.

4. Mirror formula is ____.  ## Electricity - (Holiday Assignment)

Q1: Two metallic wires A and B of same material are connected in parallel. Wire A has length l and radius r and wire B has length 2l and radius 2r. Compare the ratio of the total resistance of parallel combination and the resistance of wire A.

Wire A:
Length = l
Area   = πr²
R₁   = ρ  x l /(πr²)

Wire B:
Length = 2l  