If source and observer are moving towards each other with same speed and aftercrossing they are
receding each other then frequency observed by observer:
A copper ball of radius r is moving with a uniform velocity v in the oil. The dragging force acting on the ball is F. The dragging force on the copper ball of radius 2r moving with uniform velocity 2v in the oil is
In Millikan s experiment oil drops are used to measure the elementary charge e. Which statement about the behaviour of the oil drops during the experiment is correct
A listener observes the frequency “f” of stationary source. If it move toward with 3
times of velocity of sound. Then the apparent frequency of the sound will be
Five equal forces of 10N each are applied at one point and all are lying in one plane.If the angles between them are equal,the resultant force will be:
The terminal velocity of a 2 cm radius ball in liquid is 20 cms-1. What would be the terminal velocity if the radius of the ball were halved? Keeping the mass constant
The half-life of a certain element is 3.5 days at STP. If the temperature is doubled and
pressure is reduced to half then half-life of the same element will be:
A whistle is revolved with high speed in a horizontal circle of radius R. to an observer at the centre of the circle the frequency of the whistle will appear to be:
In a hydroelectric power station, the height of the dam is 10 m. How many kg of water must fall per second on the blades of a turbine in order to generate 1 MW of electrical power ? Take g = 10 ms-2
A ball of mass m moving with uniform speed collides elastically with another stationary ball.The incident ball will lose maximum kinetic energy when mass of the stationary ball is:
Styrene has empirical formula CH, and there is 92.2%C and 7.75% hydrogen. If molar mass is 104g mol¯, what will be integral multiple (n) to get molecular formula:
Surface and ground water sources are contaminated by various human activities. Which of the following is not a human activity that causes contamination in fresh water
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?
Dichlorodifluoromethane, CC/2F2 has been used in aeroso propellants and as a refrigerant. Which statement helps to explain why dichlorodifluromethane is chemically inert ?
The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears.The behaviour is a characteristic of substance forming
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
When Frazer's editors at Macmillan tried to ______ his endless augmentations, he insisted on a type size so small and a page so packed as to approach illegibility; and if that proved ______ thinner paper
Her novel published to universal acclaim, her literary gifts acknowledged by the chief figures of the Harlem Renaissance, her reputation as yet ______ by envious slights, Hurston clearly was at the ______ of her career
If the Titanic had hit the iceberg head on, its water. tight compartments might have saved it from ______, but it swerved to avoid the iceberg, and in the collision so many compartments were opened to the sea that disaster was _______
The recent drop in the prime interest rate probably results from the Federal Reserve Banks tight money policy and its effect on lending institutions rather than to the drop in the overall rate of inflation
