On the ground the gravitational force on a satellite is W. What is the gravitational force on the satellite when at a height R/50,where R is the radius of the Earth
In a spectrometer experiment monochromatic light is incident normally on a diffraction grating having 4.5 x 105 lines per meter.The second order line is seen at an angle of 30 to the normal what is the wavelength of the light?
A charged oil drop is suspended in a uniform field of 3 x 104 V/m so that it neither falls nor rises.The charge on the drop will be (Mass of charge = 9.9 x 10-15 kg and g = 10 m/s2)
A spring balance is graduated at sea level. If the body is weighted with this balance at consecutively increasing heights form the earth's surface the weight indicated by the balance will
The force exerted by the fluid in a hydraulic pump on the piston is 2000 N.If the area of the piston is 10 cm2 the fluid pressure on the piston is in N/cm2
A uniform plank of weigth 20 N is 200 cm long and rests on a support that is 60 cm from one end At what distance from that end must an 80 N weight be placed in order to balance the plank
What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant?
A body moves a distance of 10 m along a straight line under the action of a force of 5 Newton.If the work done is 25 joules. the angle which the force takes with the direction of motion of the body is:
A boat which has a speed of 5 km/h in still water crosses a river of width 1 km along the shortest path in 15 minutes.The velocity of the river in km/s is:
CFC's are known to cause depletion of ozone layer therefore their use has been banned in refrigerators and air conditioners. Which alternate compound may be suitable to replace CFC
The conversion of molecules of A to B follows a second order kineties. Doubling the concentration of A will inerease the rate of formation of B by a factor of
In the formation of NaCl crystals from its aqueous solution, its cubic shape is changed to needle like when 10% urea is present as impurity, this phenomenon is called as
Surface and ground water sources are contaminate by various human activity. which of the following is not a human activity that causes contamination in fresh water?
The net heat change in a chemical reaction is the same whether it is brought about in two or more different ways in one or several steps.it is known as
One of the environmental problem is the formation of oil slicks when oil is spilled form tankers in sea water. Which treatment is suitable to remove oil slicks
The gecko a small lizard can up a smooth glass window the gecko has millions of microscopic hairs on its toes and each hair has thousand of pads at its tip the result is that the molecules in the pad are extremely close to the glass surface on which the gecko is climbing.
What is the attraction between the gecko is climbing.
The rate of reaction between A and B increases by a factor of 100, when the concentration of A is increased 10 folds, the order of reaction with respect to A is
An organism of the lineage of animals in which the blastopore of the developing embryo becomes the anus, while a second opening becomes the mouth called:
Triploblastic, unsegmented, acoelomates exhibiting bilateral symmetry and reproducing both asexually and sexually, with some parasitic forms are included in
Although the manager agreed to more flexible work schedule he said that it must be posted on the bulletin board so that both management and labour will know that everyone is assigned to do
The director of the Miss America pageant continues to maintain that the judges ultimate choice is based less on the physical appearance of the contestant as on her intelligence talent and personality
The authority of voice in Frazer's writing strikes many readers today as ______ colonialism; his prose seems as invulnerable and expansive as something on which the sun was presumed never to set
Glendon providers a dark underside to Frederick Jackson Turner's frontier thesis that saw rugged individualism as the essence of American society ______ an individualism that she sees as ______ atomism
The president of the block association tried to convince her neighbours they should join forces to prevent crime in the neighbour hood rather than continuing to be victimized
