Title Advanced series 8th class Physics - Solutions.pdf ✅

Class 8 Physics Table of Content 1. Units and Dimension 1 – 21 2. Motion in a Straight Line 22 – 83 3. Newton’s Laws of Motion 84 – 112 4. Pressure 113 – 124 5. Friction 125 – 139 6. Sound 140 – 147 7. Light 148 – 207 8. Electricity 208 - 214 9. Stars and The Solar System 215 - 222

Class 8 – Physics | A - 8 Units and Dimensions 1 1. Units and Dimensions Solutions LEVEL: I 1. Correct option: (C) 1000m. -15 1fermi=10 m 1Nautical mile =1852m 1century =100 years The International System of Units (SI) uses the kilometre as the unit of distance. A metre can measure both length and distance. It is a SI unit with the symbol "m." The unit of measurement for length and distance is the metre. 1 1m= km 1000 The conversion factor is 1000 to convert kilometres to meters. 2. Correct option: (B) Ampere. The unit of electric current is the Ampere (A). 3. Correct option: (A) Radian. The radian, denoted by the symbol "rad," is the SI-derived unit of plane angle. The plane angle that an arc with length equal to the circle's radius subtends at the circle's centre is known as a radian. As a result, we discovered that a plane angle is measured in radians. 4. Correct option: (B) 6 10 m− . Since micro is the submultiple, the value of 1 micron is equivalent to 6 10 m− . However, the micron is the unit used to measure microscopic distance. 5. Correct option: (A) Light year. The term "astronomical unit" (AU) refers to the average distance between the Sun and the Earth. Light Year: A light year is the distance that light travels in a vacuum in one year. The light year is used to calculate the separation between celestial bodies. 6. Correct option: (A) Light year. The distance travelled by light in a vacuum in one year is called a light year. 7. Correct option: (B) 11 1.5 10 m  . 11 1 A.U=1.5 10 m  11 1.5 10 m  metres are equivalent to one astronomical unit. The distance between the Earth and the Sun is measured in terms of length. From the greatest distance (aphelion) to the smallest (perihelion), and once a year back again, that distance changes as the Earth orbits the Sun.
Class 8 – Physics | A - 8 Units and Dimensions 2 8. Correct option: (A) 15 9.5 10 m  . A light-year is a unit of measurement used to express astronomical distances; it is around 9.46 trillion kilometres 12 9.5 10 km  long or 15 9.5 10 m  . 9. Correct option: (D) 1609m. 1mile = 1609 m The appropriate conversion factor is 1609. It displays how many metres there are in a mile. Consequently, 1609 metres are equal to 1 mile. 10. Correct option: (A) 15 10 m− . The SI unit of length is sometimes also referred to as the femtometre. A Fermi is a remarkably short length. It is equivalent to 15 10 m− . 11. Correct option: (A) 10 10 m− . We are aware that an angstrom is a very small unit of length. The diameter of elementary particles as well as the radius of an atom are typically expressed using the Angstrom unit. 12. Correct option: (C) 8 10 sec − . 8 1shake =10 Nanoseconds 1shake =10 sec − An informal metric unit of time known as a shake is used to measure the timing of various nuclear reactions in nuclear physics. It is roughly equal to the length of a nuclear chain reaction involving quick neurons. It can be used in circuits as well. 13. Correct option: (C) 27 1.67 10 kg −  . 27 1A.M.U 1.67 10 kg − =  Its mass is one-twelfth that of an atom of carbon-12. 14. Correct option: (B) 1000 kg. 1 mtertic tonne = 1000kg Although the S.I. standards refer to the metric tonne as the "tonne," the United States government prefers to use the term "metric tonne." 15. Correct option: (B) 14.59kg. 1slug=14.59kg Based on normal gravity, the international foot, and the avoirdupois pound, one slug weighs 32.1740 lb (14.59390 kg). An object with a mass of 1 slug would weigh around 32.2 lbf, or 143 N, at the Earth's surface. 16. Correct option: (C) 454 grams. 1pound=454grams. A pound is a unit of weight that is roughly equivalent to 454 grammes. In the FPS system, it serves as the unit of weight measurement.