The real value of 'a' for which sum of square of the roots of the equation
A Wire When connected to 220 V mains supply has power dissipation 
. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is 
.
If two mirrors are kept at 60 degree to each other, then the number of images formed by them is :
If in a circular coil A of Radius R, current i is following and in another coil B of radius 2R is current 2i is flowing, then the ratio of the magnetic fields 
If an ammeter is to be used in a place of a voltmeter, then we must connect with the ammeter a:
If suddnly the gravitational force of attraction between earth and a satellite revolving around it becomes zero, then satellaite will:
If a body looses half of its velocity on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest?
From a building two balls A and B are thrown such that A is thrown upwards and B is thrown downwards (both vertically).
A ball whoose Kinetic Energy is E, is projected at an angle of 45 degree to the horizontal. The kinetic energy of the ball at the highest point of its flight will be:
The minimum velocity (in ms-I) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is :
Initial angular velocity of a circular disc of mass M is 
. Then two small spheres of mass m are attached gently to two diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc?
In a simple harmonic oscillator, at the mean position
The part of a transistor which is most heavily doped to produce large number of majority carriers is
The part of a transistor which is most heavily doped to produce large number of majority carriers is
The energy band gap is maximum in
If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should :
When temperature increases, the frequency of a tuning fork :
Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will :
The kinetic energy needed to project a body of mass m from the earth's surface (radius R) to infinity is :
An astronomical telescope has a large aperture to :
The power factor of an AC circuit having resistance R and inductance L (connected in series) and an angular velocity (r) is:
Length of a string tied to two rigid supports is 40 cm. Maximum length (wavelength in cm) of a stationary wave produced on it, is:
Which statement is incorrect?
Which of the following is more close to a black body?
If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to
If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to
By increasing the temperature, the specific resistance of a conductor and a semiconductor
If No is the original mass of the substance of half-life period t1/2 = 5 years, then the amount of substance left after 15 years is:
Infrared radiations are detected by
Identify the pair whose dimensions are equal:
Which of the following are not electromagnetic waves?
The escape velocity of a body depends upon mass as
Which of the following is used in optical fibers?
Electromagnetic waves are transverse in nature is evident by :
Correct the following statements:
(a) Surgical methods of contraception prevent gamete formation.
(b) All sexually transmitted diseases are completely curable.
(c) Oral pills are very popular contraceptives among the rural women.
(d) In E. T. techniques, embryos are always transferred into the uterus.
(a) Abortions could happen spontaneously too. (True/False)
(b) Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities/defects in the female partner. (True/False)
(c) Complete lactation could help as a natural method of contraception. (True/False)
(d) Creating awareness about sex related aspects is an effective method to improve reproductive health of the people. (True/False)
What are the measures one has to take to prevent from contracting STDs?
Removal of gonads cannot be considered as a contraceptive option. Why?
Is the use of contraceptives justified? Give reasons.
What are the suggested reasons for population explosion?
Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement.
Is sex education necessary in schools? Why?
Suggest the aspects of reproductive health which need to be given special attention
in the present scenario
What do you think is the significance of reproductive health in a society?
Calculate the drift velocity of electrons in a copper wire of cross-sectional area 1 mm2 when a current of 2.5 A flows through it.
For copper, n = 8.5 × 1028 per m3
The charge on an electron, Q = 1.6 × 10-19 C
How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?
In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?
What is parturition? Which hormones are involved in induction of parturition?