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An observer can see through a pin-hole the top end of a thin rod of height h, placed as shown in figure. The beaker height is 3h and its radius h. When the beaker is filled with a liquid up to a height 2h, he can see the lowe ...

*Image* A ray of light passes through four transparent media with refractive indices n1, n2, n3 and n4 as shown in figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we ...

The convex surface of a plano-convex lens with curvature radius R=40cm comes into contact with a glass plate . A certain ring observed in reflected light has radius r=2.5mm. Watching the given ring , the lens was grad ...

A concave mirror form on a screen, a real image of twice the linear dimension of the object. Object and screen are then moved until the image is three times the size of the object. If the shift of the screen be 25 cm determin ...

x and y are the distances of an object and its image from the focus of a spherical mirror. The focal length of the mirror is f, the x, f, y are in ...

An object is placed in front of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower-half of the convex mirror. If the distance between the object and the plane mirror be 30 cm, it is found ...

A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror. The size of the image is approximately equal to ...

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Match the following 22) Heat supplied at constant pressure A)ΔS>0 23) orderness decreases B)ΔH 24) Heat supplied at constant volume C)ΔG<0 25) spontaneity D)ΔU ...

Solubility of Ca(OH)2 is greatest in water ...

Which is most soluble in 0.1 M AgNO3 soln? ...

Use the data and answer the questions that follow. Compound Ksp BaCrO4 8.5 x 10-11 FeCO3 2.1 x 10 –11 MnCO3 8.8x10-11 Ag2CO3 8.1 x 10-12 Ba(OH)2 5 x 10-3 Ca(OH)2 1.3 x 10-6 Ni(OH)2 1.6 x 10–16 Which is least soluble in wa ...

The best oxidizing agent among the following is ...

While Fe3+ is stable Mn3+ is not stable in acid solution because ...

A and B are independent events.P(AUB) = 1/2 , P(A) = 1/3 , what is P(B) ? ...

Linked Comprehension This is a comprehension for Questions 16-18 Redox reactions play an important role in chemistry and biology. The values of standard redox potential (E0) of two half cell reactions decide which way the rea ...

x is a negative number.Which is bigger ? x3 or x5 . ...

There are m horizontal parallel lines and n vertical parallel lines which are intersecting.What are the number of distinct rectangles formed by the lines ? ...

PCl5 [eq] PCl3+Cl2 STATEMENT-I: For the above equilibrium addition of inert gas at constant volume doesn't have any effect on the equilibrium. STATEMENT-II: The total pressure of the system is increased on addition of ine ...

In how many ways a three digit number can be formed using numbers from 1 to 9 (repetition not allowed) such that the unit digit is grater than the tenth digit and the tenth digit is grater than the hundredth digit ? ...

x and y are positive integers.What is the probability that x2+y2 is divisible by 5 ? ...

Given standard reduction potential of X and Y are 0.52 and -0.18 V respectively. STATEMENT-I: Y is better reducing agent than X STATEMENT-II: Reduction potential of Y is less than X ...

n fair die are tossed .What is the probability that all of them show the same number on the top surface ? ...

Reasoning Type STATEMENT-I: The endothermic reactions are favoured at lower temperature and the exothermic reactions are favoured at higher temperature. STATEMENT-II: When a system in equilibrium is disturbed by changing the ...

A quadratic curve passes through (0,9) and touches x axis at (3,0).What is the equation of the curve ? ...

x is a positive real number such that x4+1 = 62x2 . Find (x3+1/x3) ...

Rate of physisorption increases with ...

Which of the following statements is false? ...