CBSE Class 9

Calculate the work done against the gravity [CBSE Class 9 Science] (1)
A piece of ice is placed gently on the surface of water in a glass so that when the ice floats, the water conies up to the brim of the glass [CBSE Class 9 Science] (1)
What is the relationship between the commercial unit and SI unit of energy? [CBSE Class 9 Science] (1)
The following figure shows' three identical blocks of wood floating in three different liquids A, B and C of densities d1,d2 and d3 respectively. Which of these has the highest density? Give reason to justify your answer [CBSE Class 9 Science] (1)
What is the commercial unit of energy? [CBSE Class 9 Science] (1)
Why does a camel walk easily on sand but it is difficult for a man to walk on sand though a camel is much heavier than a man? [CBSE Class 9 Science] (1)
What kind of energy transformation takes place when a body is dropped from a certain height? [CBSE Class 9 Science] (1)
State the laws of floatation [CBSE Class 9 Science] (1)
Give one example each of potential energy (i) due to position (ii) due to shape [CBSE Class 9 Science] (1)
A man squeezes a pin between his thumb and finger, as shown in figure [CBSE Class 9 Science] (1)
Give any two uses of kinetic energy [CBSE Class 9 Science] (1)
What is energy? What is unit of energy? [CBSE Class 9 Science] (1)
During a period of hot weather, the atmospheric pressure on the pond shown in figure remains constant [CBSE Class 9 Science] (1)
On what factors the work done on a body depends? [CBSE Class 9 Science] (1)
Give two practical daily life applications that make use of the concept of pressure [CBSE Class 9 Science] (1)
Give two examples from everyday life where work is done [CBSE Class 9 Science] (1)
What do you mean by thrust? [CBSE Class 9 Science] (1)
Figure shows a loudspeaker cone oscillating to produce sound waves: [CBSE Class 9 Science] (1)
How does the weight of an object vary with respect to mass and radius of the earth? [CBSE Class 9 Science] (1)
Show that the weight of an object on the moon is 1/6th of its weight on the earth [CBSE Class 9 Science] (1)
Define acceleration due to gravity. Derive an expression for acceleration due to gravity in terms of mass of the earth (M) and universal gravitational constant (G) [CBSE Class 9 Science] (1)
Derive expression for force of attraction between two bodies and then define gravitational constant [CBSE Class 9 Science] (1)
Represent graphically any two separate diagrams in each case: [CBSE Class 9 Science] (1)
Two objects of masses m1and m2 having the same size are dropped simultaneously from heights h1 and h2, respectively [CBSE Class 9 Science] (1)
What is meant by reflection of sound? [CBSE Class 9 Science] (1)
Prove that if a body is thrown vertically upward, the time of ascent is equal to the time of descent [CBSE Class 9 Science] (1)
Give reasons for the following: The reverberation time of a hall used for speeches should be very short [CBSE Class 9 Science] (1)
Calculate the average density of the earth in terms of g, G and R [CBSE Class 9 Science] (1)
On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why? [CBSE Class 9 Science] (1)
State an approximate value for the speed of sound in air [CBSE Class 9 Science] (1)