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CBSE Class 10 Free Doubts and Solutions

Write the number of periods the modern periodic table has state the changes in  metallic character and atomic size of elements as we move from left to right in a period .Also state the changes if any in the valency and atomic size of elements as we move down a group

Asked by ansarihalim414 14th December 2018, 8:22 PM

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गोपियों द्वारा उद्धव को भाग्यवान कहने में क्या व्यंग्य ननहहत है?

Asked by Yashjain0224 14th December 2018, 7:59 PM

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a vessel is in the form of an inverted cone its height is8cm and radius of top which is open is 5cm . it is filled up with water up to brim when lead short each of which is the sphere of radius 0.5 cm are dropped into the vessal 1/4th of water flows out. find the no of lead short droped in vessal.

Asked by vikramjsingh53 14th December 2018, 5:33 PM

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Q.1. Which one is an electromagnetic wave out of sound waves X-Rays, Infrared rays & repulse in water? Q.2. Why are many thermal power plants setup near coal & oil fields?

Asked by agraharianiruddha 14th December 2018, 3:00 PM

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If p(x) = x^2 + ax + b such that p(x) = 0 and p(p(p(x))) = 0 have equal root then find the integral value of p(0).p(1).

Asked by acv27joy 14th December 2018, 2:46 PM

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Let ABCD and EFGH be two square each of side length 12 cm and are placed such that the corner of one lies at the centre of another. Let E coincide with centre of ABCD and C coincide with centre of EFGH. Let the squares in the above situation forms a quadrilateral EJCK, such J is a point on BC and K is a point on CD.If the length of BJ is 3 cm find the area of EJCK.

Asked by acv27joy 14th December 2018, 2:41 PM

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If x,y,z are real numbers satisfying the system,  log_2[(xyz-3+log_5 x)] = 5  log_3⁡[(xyz-3+log_5 y)] = 4  log_4[(xyz-3+log_5 z)] = 4 , find mod(log_5 x) + mod(log_5 y) + mod(log_5 z). (log_n k means logarithm of k to the base n)

Asked by acv27joy 14th December 2018, 2:35 PM

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CBSE - X - Mathematics

Asked by bhattjeewanti9999 14th December 2018, 11:12 AM

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an object is placed 10 cm from a convex mirror of radius of curvature 60 cm then find position of image

Asked by 02shubhamkj 13th December 2018, 8:26 PM

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An object is placed at a distance of 12cm in front of a concave mirror.It forms a real image 4 times larger than the object. Calculate the distance of the image from the mirror.

Asked by 02shubhamkj 13th December 2018, 8:19 PM