List of top Questions asked in UP Board X

A convex mirror of radius of curvature 2 metres is attached to a motor bike to watch any other vehicle coming from behind. Calculate the location and position of a vehicle which is at 4 metres behind the bike as seen in the mirror. Also explain by the ray diagram.
The bond present in chlorine molecules is:
The reactions in which new compounds are formed by exchange of ions, are called:
The function of xylem in plants is:
In which of the following plants did Mendel perform his experiments on inheritance?
A solution turns red litmus into blue. The possible pH value of this solution is:
Useful substance in making water bacteria free is:
The alkene in the following is:
Which of the following metals produces hydrogen gas with cold water?
Which of the following metals produces hydrogen gas with cold water?
On which of the following does the resistance of an electrical conductor not depend?
In which combination the four resistors be connected to have minimum resultant resistance?
One needs the help of which of the following rules to know the direction of the magnetic field produced due to a current carrying conductor?
The sun appears whitish:
The alkene in the following is:
The unit of the power of the lens is:
If \( BL \) and \( CM \) are medians of a right triangle \( ABC \) whose \( \angle A = 90^\circ \), then prove that: \( 4(BL^2 + CM^2) = 6 BC^2 \).
Divide a 10 cm line segment in the ratio 3:2.
When a beam of white light falls on the surface of a triangular prism of glass, it splits, after emerging out from the prism, into various colours with different deviations. Which colour has maximum deviation?
To have a real and enlarged image of an object by a concave mirror, the position of the object should be:
Find the area of a sector whose angle is \( 30^\circ \) of a circle whose radius is 4 cm. Also, find the area of the corresponding major sector.
Find the values of \( x \) and \( y \) from the following equations: \[ \frac{30}{x - y} + \frac{44}{x + y} = 10 \quad \text{and} \quad \frac{40}{x - y} + \frac{55}{x + y} = 13 \]
If 1 is subtracted from the numerator of a fraction, then it becomes \( \frac{1}{3} \), and if 8 is added to its denominator, then it becomes \( \frac{1}{4} \). Find that fraction.
Find the mean of the following data:
If the median of the following data is 525 and the sum of frequencies is 100, then find values of \( x \) and \( y \): % Frequency Table \[ \begin{array}{|c|c|} \hline Class Interval & Frequency
\hline 0 - 100 & 2
100 - 200 & 5
200 - 300 & x
300 - 400 & 12
400 - 500 & 17
500 - 600 & 20
600 - 700 & y
700 - 800 & 9
800 - 900 & 7
900 - 1000 & 4
\hline \end{array} \]