NCERT Solutions Class 11 Physics Chapter 14 Oscillations
Question. Which of the following examples represent periodic motion? (a) A swimmer completing one (return) trip from one bank of a river to the other and back. (b) A freely suspended bar magnet displaced from its N-S direction and released. (c) A hydrogen molecule rotating…
NCERT Solutions Class 11 Physics Chapter 4 Motion in a Plane
Question : State, for each of the following physical quantities, if it is a scalar or a vector: Volume, mass, speed, acceleration, density, number of moles, velocity, angular frequency, displacement, angular velocity. Answer : Scalar: Volume, mass, speed,…
NCERT Solutions Class 11 Physics Chapter 9 Mechanical Properties of solids
Question. A steel wire of length 4.7 m and cross-sectional area 3.0 × 10–5 m2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of 4.0 × 10–5 m2 under a given load. What is the ratio of the Young’s modulus of steel…
NCERT Solutions Class 11 Physics Chapter 10 Mechanical Properties of Fluids
Question : Explain why (a) The blood pressure in humans is greater at the feet than at the brain (b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km (c)…
NCERT Solutions Class 11 Physics Chapter 5 Laws of Motion
Question : Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg, (a) just after it is dropped from the window of a stationary train, (b) just after it is dropped from the window of a train running at a constant velocity of 36 km/h, (c)…
NCERT Solutions Class 11 Physics Chapter 13 Kinetic Theory
Question. Estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at STP. Take the diameter of an oxygen molecule to be 3Å. Answer Diameter of an oxygen molecule, d = 3Å Radius, r = d/2 = 3/2 = 1.5 Å = 1.5 × 10–8…
NCERT Solutions Class 11 Physics Chapter 2 Units and Measurements
Question. Fill in the blanks (a) The volume of a cube of side 1 cm is equal to.....m3 (b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to ... (mm)2 (c) A vehicle moving with a speed of 18 km h–1covers....m in 1 s (d) The relative density of…
NCERT Solutions Class 11 Physics Chapter 7 System of particles and rotational motion
Question : Give the location of the centre of mass of a (i) sphere, (ii) cylinder, (iii) ring, and (iv) cube, each of uniform mass density. Does the centre of mass of a body necessarily lie inside the body? Answer : Geometric centre; No The centre of mass (…
NCERT Solutions Class 11 Physics Chapter 11 Thermal properties of matter
Question. The triple points of neon and carbon dioxide are 24.57 K and 216.55 K respectively. Express these temperatures on the Celsius and Fahrenheit scales. Answer : Kelvin and Celsius scales are related as: TC = TK – 273.15 … (i) Celsius and…
NCERT Solutions Class 11 Physics Chapter 12 Thermodynamics
Question. A geyser heats water flowing at the rate of 3.0 litres per minute from 27 °C to 77 °C. If the geyser operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is 4.0 × 104 J/g? Answer : Water is flowing at a rate…
NCERT Solutions Class 11 Physics Chapter 15 Waves
Question. A string of mass 2.50 kg is under a tension of 200 N. The length of the stretched string is 20.0 m. If the transverse jerk is struck at one end of the string, how long does the disturbance take to reach the other end? Answer : Mass of the string, M = 2…
NCERT Solutions Class 11 Physics Chapter 6 Work Power Energy
Question. The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative: (a) work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket. (b) work done by gravitational…
NCERT Solutions Class 11 Physics Chapter 8 Gravitation
Question : Answer the following: (a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means? (b) An…