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(A) 1:4(B) 2:1(C) 4:13(D) 2:5">Two identical balls A and B are released from the position shown in figure. They collide elastically with each other on the horizontal portion. The ratio of height attained by A and B after collision is: (neglect friction)
(A) 1:4(B) 2:1(C) 4:13(D) 2:5

For A: $\begin{array}{l}mh(4h)=\frac{1}{2}mu_{1}^{2}\\u_{1}=\sqrt{8gh}\end{array} $ For B: $\begin{array}{l}mh(h)=\frac{1}{2}mu_{2}^{2}\\u_{2}=\sqrt{2gh}\end{array} $ We know that, The relative velocity before collision = after collision u1... View Article

Mark the odd one out: (A) Olive (B) Lichi (C) Egg (D) Apple

All are fruits except egg. Therefore, egg is the odd one. So, the correct option is (C)

Select the pair whose dimensions are same (a) Pressure and stress (b) Stress and strain (c) Pressure and force (d) Power and force

Dimensions of a physical quantity are the powers to which the fundamental units are raised to obtain one unit of... View Article

State whether pressure is a scalar or vector

Scalar quantity is defined as the physical quantity with magnitude and no direction whereas a vector quantity is defined as... View Article

A shopkeeper gives books on rent for reading. She takes a fixed charge for the first two days, and an additional charge for each day thereafter. Latika paid Rs 22 for a book kept for six days, while Anand paid Rs 16 for the book kept for four days. Find the fixed charges and the charge for each extra day. (A) Rs 13, Rs 2 (B) Rs 10, Rs 3 (C) Rs 12, Rs 9 (D) Rs 14, Rs 5

Let the fixed charge by Rs x and additional charge by Rs y per day Number of days for Latika... View Article

A wire fixed at the upper end stretches by length l by applying a force F. The work done in stretching is: (A) F/2l (B) Fl (C) 2F/l (D) Fl/2

Work done by a constant force in displacing the object by a distance l is given by Work done =... View Article

An alloy of copper, silver and gold is found to have a copper constituting the ccp lattice. If silver atoms occupy the edge centres and gold is present at body centre, the alloy has a formula: (a) CuAgAu (b) Cu₄Ag₂Au (c) Cu₄Ag₃Au (d) Cu₄Ag₄Au

Effective number of Cu atoms in a unit cell = 8 x (1/8) + 6 x (1/2) Effective number of... View Article

Seed plants are all __________ (A) Heterosporous (B) Dioecious (C) Monoecious (D) Homosporous

Heterospory is the condition of producing two types of spores. Seed plants are heterosporous. They produce two kinds of spores,... View Article

In the depletion region of an unbiased PN junction diode there are (A) Only electrons (B) Only holes (C) Both electrons and holes (D) Only fixed ions

In the depletion region of an unbiased p-n junction diode, there are only fixed ions. Depletion layer contains only fixed... View Article

Money value of business reputation is called ________. (A) Liability (B) Goodwill (C) Premises (D) Bank balance

Money value of business reputation is called Goodwill Goodwill is an intangible asset associated with the purchase of one company... View Article

Diversification in plant life appeared initially (A) Due to long periods of evolutionary changes (B) Due to abrupt mutations (C) Suddenly on earth (D) By seed dispersal

Diversification in plants life appeared due to long periods of evolutionary changes. Initially, plants first grew as thalloid. There were... View Article

A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 radians per second. If the horizontal component of earths’s magnetic field is 0.2 x 10^-4 T, then the e.m.f developed between the two ends of the conductor is (A) 5 μV (B) 50 μV (C) 5 mV (D) 50 mV

Given l = 1 m ω = 5 rad/s B = 0.2 x 10-4 T ε = Bωl2/2 ε =... View Article

Aluminium is much more reactive than iron because its standard reduction potential is higher than iron. Still aluminium is less easily corroded than iron because: (A) aluminium reacts with atmospheric carbon dioxide to form a self protective layer of Al₂O₃ (B) it has a higher reducing power and forms a self protective layer of Al₂O₃ (C) it has a higher reducing power and does not react with oxygen so easily (D) both A and B

The standard reduction potential of aluminium is higher than iron. Hence, it is much more reactive than iron. However, aluminium... View Article

and
$vec{v_{2}}$
. At the initial moment their position vectors are
$vec{r_{1}}$
and
$vec{r_{2}}$
respectively. The condition for particles A and B for their collision is: (a)
$vec{r_{1}}-vec{r_{2}}= vec{v_{1}}-vec{v_{2}}$
(b)
$frac{vec{r_{1}}-vec{r_{2}}}{left | vec{r_{1}}-vec{r_{2}} right |}=frac{vec{v_{2}}-vec{v_{1}}}{left | vec{v_{2}}-vec{v_{1}} right |}$
(c)
$vec{r_{1}}.vec{v_{1}}=vec{r_{2}}.vec{v_{2}}$
(d)
$vec{r_{1}}times vec{v_{1}}=vec{r_{2}}times vec{v_{2}}$
">Two particles A and B move with constant velocities
$vec{v_{1}}$
and
$vec{v_{2}}$
. At the initial moment their position vectors are
$vec{r_{1}}$
and
$vec{r_{2}}$
respectively. The condition for particles A and B for their collision is: (a)
$vec{r_{1}}-vec{r_{2}}= vec{v_{1}}-vec{v_{2}}$
(b)
$frac{vec{r_{1}}-vec{r_{2}}}{left | vec{r_{1}}-vec{r_{2}} right |}=frac{vec{v_{2}}-vec{v_{1}}}{left | vec{v_{2}}-vec{v_{1}} right |}$
(c)
$vec{r_{1}}.vec{v_{1}}=vec{r_{2}}.vec{v_{2}}$
(d)
$vec{r_{1}}times vec{v_{1}}=vec{r_{2}}times vec{v_{2}}$

For the collision of particles A and B, the final position should be equal Therefore, Hence, The correct option is... View Article

Find the sum of -52 and 52

Given (-52) + 52 52 – 52 = 0 Therefore, The sum of (-52) + 52 is 0

One man control is the best in the world if the man is capable enough to manage everything. This statements states about which form of business? (A) Partnership (B) Company (C) Sole proprietorship (D) Trust

The given statement states about sole proprietorship form of business. The individual takes all initiatives and run the business in... View Article

Out of following which one is not an example of a solution? (a) Air (b) Brass (c) Amalgam (d) Benzene in water

Benzene in water is not an example of solution. Hence, the correct option is (d)

A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr. What is the length of the platform? (in m)

Speed = (54 x 5/18) m/sec Speed = 15 m/sec Length of the train = (15 x 20)m We get,... View Article

A current of 9.65 Ampere flowing for 10 minutes deposits 3 g of metal which is monovalent, the atomic mass of metal is a: A.10 B. 50 C. 30 D. 96.5

Given, Current flowing, I = 9.65 Ampere Time = 10 min Q = It Q = 9.65 x 10 x... View Article

Find the value of cosec 30 geometrically.

Let us consider an equilatareal triangle ABC, whose all sides are equal to 2a, respectively. Also, all the angles are... View Article

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