Recent questions tagged 144

Extrusion of second polar body from egg nucleus occurs

asked Jul 8, 2019 by pady_1

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If $y = \sqrt{\cos 2x}$, then $y \frac{d^2y}{dx^2} + 2y^2$ is equal to :

asked Dec 19, 2018 by pady_1

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$(\overrightarrow{a} \times \overrightarrow{b} ) \times (\overrightarrow{b} \times \overrightarrow{c})$ is equal to :

asked Dec 19, 2018 by pady_1

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If $\overrightarrow{a} = 2 \hat{i} + 3 \hat{j} - 4 \hat{k} , \; \overrightarrow{b} = \hat{i} + \hat{j} +\hat{k}$ and $\overrightarrow{c} = 4 \hat{i} + 2 \hat {j} + 3 \hat{k}$, then $|\overrightarrow{a} \times (\overrightarrow{b} \times \overrightarrow{c} )|$

asked Dec 19, 2018 by pady_1

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The minimum value of $(x- \alpha) ( x-\beta)$ is:

asked Dec 11, 2018 by pady_1

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A heat engine absorbs heat $q_1$ from a source at temperature $T_1$ and heat $q_2$ from a source at temperature $T_2$. Work done is found to be $J (q_1 +q_2)$. This is in accordance with :

asked Dec 11, 2018 by pady_1

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Bottles containing $C_6H_5I$ and $C_6H_5CH_2I$ lost their original labels. They were labelled A and B for testing. A and B were separately taken in a test tube and boiled with NaOH solution. The end solution in each tube was made acidic with dilute $HNO_3$ and then some $AgNO_3$ solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment ?

asked Dec 11, 2018 by pady_1

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The image of the point $(-1, 3, 4)$ in the plane $x - 2y = 0$ is :

asked Nov 13, 2018 by pady_1

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The value of the 'spin only' magnetic moment for one of the following configurations is 2.84 BM. The correct one is :

asked Nov 5, 2018 by pady_1

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Acetyl bromide reacts with excess of $CH_3MgI$ followed by treatment with a saturated solution of $NH_4Cl$ given

asked Nov 5, 2018 by pady_1

1 answer

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

asked Aug 21, 2018 by pady_1

2 answers

Two cars moving in opposite directions approach each other with speed of $22\; m/s$ and $16.5\; m/s$ respectively. The driver of the first car blows a horn having a frequency $400\; Hz$. The frequency heard by the driver of the second car is [velocity of sound $340\; m/s$] :

asked Aug 21, 2018 by pady_1

1 answer

Coefficient of linear expansion of brass and steel rods are $\alpha_1$ and $\alpha_2$. Lengths of brass and steel rods are $l_1$ and $l_2$ respectively. If $(l_2 – l_1)$ is maintained same at all temperatures, which one of the following relations holds good ?

asked Aug 21, 2018 by pady_1

1 answer

A source of sound S emitting waves of frequency $100 \;Hz$ and an observer O are located at some distance from each other. The source is moving with a speed of $19.4 ms^{-1}$ at an angle of $60^{A^°}$ with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air $330 ms^{-1}$), is : <br>

asked Aug 21, 2018 by pady_1

1 answer

Select the option which is not correct with respect to enzyme action:

asked Aug 20, 2018 by pady_1

1 answer

Macro molecule chitin is

asked Aug 20, 2018 by pady_1

1 answer

A patient brought to a hospital with myocardial infarction is normally immediately given

asked Aug 20, 2018 by pady_1

2 answers

Himgiri' developed by hybridisation and selection for disease resistance against rust pathogens is a variety of :

asked Aug 16, 2018 by pady_1

2 answers

Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzyme?

asked Jul 26, 2018 by pady_1

1 answer

In a standard ECG which one of the following alphabets is the correct represention of the respective activity of the human heart ?

asked Jul 26, 2018 by pady_1

1 answer

Consider the following four statements (1-4) about certain desert animals such as kangaroo-rat. (i) They have dark colour and high rate of reproduction and excrete solid urine (ii) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs (iii) They feed on dry seeds and do not required drinking water (iv) They excrete very concentrated urine and do not use water to regulate body temperature Out of these four, which two are correct-

asked Jul 26, 2018 by pady_1

0 answers

Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be:-

asked Jul 26, 2018 by pady_1

1 answer

In a moss the sporophyte-

asked Jul 25, 2018 by pady_1

1 answer

The salivary gland chromosomes in the dipteran larva, are useful in gene mapping because -

asked Jul 24, 2018 by pady_1

1 answer

The most likely reason for the development of resistance against pesticides in insects damaging a crop is :-

asked Jul 24, 2018 by pady_1

1 answer

The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes : -

asked Jul 24, 2018 by pady_1

1 answer

During the formation of bread it becomes porous due to release of $CO_2$ by the action of : -

asked Jul 23, 2018 by pady_1

1 answer

Difference in gram positive and gram negative bacteria is due to-

asked Jul 20, 2018 by pady_1

1 answer

Which gland secretes odourous secretion in mammals :

asked Jul 20, 2018 by pady_1

1 answer

Extrastelar secondary growth takes place by :

asked Jun 15, 2018 by pady_1

1 answer

Find 1.2 $\div$ 25

asked Dec 31, 2015 by pady_1

0 answers

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