Exercise : Solutions of Questions on Page Number : 134 Q1 :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 force in the above case, (c) work done by friction on a body sliding down an inclined plane, (d) work done by an applied force on a body moving on a rough horizontal plane with uniform…
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Exercise : Solutions of Questions on Page Number : 109 Q1 :Give the magnitude and direction of the net force acting on (a) a drop of rain falling down with a constant speed, (b) a cork of mass 10 g floating on water, (c) a kite skillfully held stationary in the sky, (d) a car moving with a constant velocity of 30 km/h on a rough road, (e) a high-speed electron in space far from all material objects, and free of electric and magnetic fields. Answer : (a) Zero net force The rain drop is falling with a constant speed.…
Exercise : Solutions of Questions on Page Number : 85 Q1 : 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, density, number of moles, angular frequency Vector: Acceleration, velocity, displacement, angular velocity A scalar quantity is specified by its magnitude only. It does not have any direction associated with it. Volume, mass, speed, density, number of moles, and angular frequency are some of the scalar physical quantities. A vector quantity is specified…
Exercise : Solutions of Questions on Page Number : 55 Q1 :In which of the following examples of motion, can the body be considered approximately a point object: (a) a railway carriage moving without jerks between two stations. (b) a monkey sitting on top of a man cycling smoothly on a circular track. (c) a spinning cricket ball that turns sharply on hitting the ground. (d) a tumbling beaker that has slipped off the edge of a table. Answer : Answer: (a), (b) (a) The size of a carriage is very small as compared to the distance between two stations.…
NCERT Solution Class 11 Physics Chapter 1 Units and Measurement Exercise : Solutions of Questions on Page Number : 35 Q1 : 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 lead is 11.3. Its density is ….g cm-3or . …kg m-3. Answer : (a) 1 cm =1/100 m Volume of the…
Exercise : Solutions of Questions on Page Number : 99 Q1 :What would be the shape of the demand curve so that the total revenue curve is (a) a positively sloped straight line passing through the origin? (b) a horizontal line? Answer : (a) If the total revenue curve is a positively sloped straight line passing through the origin, then the slope of the demand curve will be a horizontal line parallel to the x-axis. (b) If the total revenue curve is a horizontal line, then the demand curve will be downward sloping. Q2 :From the schedule provided below calculate…
Exercise : Solutions of Questions on Page Number : 84 Q1 :Explain market equilibrium. Answer : Market equilibrium is defined as the state of rest that is determined by the rational objectives of the consumers and the producers (i.e. maximisation of satisfaction and profit respectively). It is a state where the aggregate quantity that all the firms want to sell are purchased by consumers, i.e. market supply equals market demand. At this situation, there is no incentive or tendency for any change in quantity demanded, quantity supplied and price. That is: yd = ys. Q2 :When do we say that…
Exercise : Solutions of Questions on Page Number : 66 Q1 :What are the characteristics of a perfectly competitive market? Answer : Perfect Competition This type of market structure refers to the market that consists of a large number of buyers and also a large number of sellers. No individual seller is able to influence the price of an existing product in the market. All sellers in a perfect competition produce homogenous outputs, i.e. the outputs of all the sellers are similar to each other and the products are uniformly priced. Features of Perfectly Competitive Market 1) A large number…
Exercise : Solutions of Questions on Page Number : 49 Q1 :Explain the concept of a production function. Answer : The production function of a firm depicts the relationship between the inputs used in the production process and the final output. It specifies how many units of different inputs are needed in order to produce the maximum possible output. Production function is written as: Qx = f (L, K) Where Qx represents units of output x produced. L represents units of labour employed. K represents units of capital employed. The above equation explains that Qx, units of output x are…
Exercise : Solutions of Questions on Page Number : 34 Q1 :What do you mean by the budget set of a consumer? Answer : It refers to the set of consumption bundles that are available to or affordable by the consumer; while being aware of his/her income-level and the existing market prices. Q2 :What is a budget line? Answer : A budget line represents the different combinations of two goods that are affordable and are available to a consumer; while being aware of his/her income-level and market prices of both the goods. Let x1 be the amount of good 1.…