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What does the phrase “her barred face identity mask” mean?

A substance X is added to LPG cylinders while fillings so as to make the detection of leakage of LPG from the cylinders easy.
(a) Name the substance X.
(b) How does substance X make the detection of leakage of LPG easy?

The equivalent resistance between $A$ and $B$ (of the circuit as shown in figure) is

Draw a diagram of a block and tackle system of pulleys having a velocity ratio of 5. In your diagram indicate clearly the points of application and the directions of the load L and effort E. Also mark the tension T in each strand.

A wire $40cm$ long is bent into a rectangular frame $15cm\times 5cm$ and placed perpendicular in a magnetic field intensity of $0.8T$ . The frame is changed into a square frame and the field is increased to $1.4T$ in a time interval of $0.5s$. The e.m.f induced in the frame is ________.

A man holding a lighted candle in front of a thick glass mirror and viewing it obliquely sees a number of images of the candle. What is the origin of these multiple images?

A gas initially $15\text{kPa}$, $1.5\text{L}$ and $280\text{K}$ expands at constant temperature until the pressure drops to $12\text{kPa}$. The gas is then held at the constant pressure of $12\text{kPa}$ and heated until the temperature rises to $350\text{K}$. What is the final volume of the gas?

Which quantity has the unit of watt?

in a bar magnet is there a line or a plane separating North and South sides of a magnet

The structure of solids is investigated by using

Down​

2. This layer protects us from harmful ultraviolet rays. (5)​



Across​

3. Produced on incomplete combustion of fuels. (14)​



Down​

4. It is essential for combustion. (6)​

Down​

5. Disease which is caused by drinking contaminated water. (7)​



Across​

6. This chemical protects our crops and is washed into water bodies from the field. (9)​

Down​

7. River which is famous in India and sustains most of the northern, central, and eastern Indian population. (5)​

An object is placed at a distance of $30cm$ from the lens. Its image is formed at a distance of $10cm$ on the same side of the lens. Find the focal length of the lens used.

Answer
the following by choosing the right option from those given below:

(a)
The Ancient Mariner stopped one of the three wedding guests
because…………

1. he
   wanted to attend the wedding with him

   
   

2. he
   wanted him to sit with him

   
   

3. he
   wanted him to listen to his story

   
   

4. he
   wanted to stop him from going to the wedding

   
   

(b)
The wedding guest remarked that he was 'next of kin' which means that
……..

1. he
   was a close relation of the bridegroom

   
   

2. he
   was a close relation of the bride

   
   

3. he
   was next in line to get married

   
   

4. he
   had to stand next to the bridegroom during the wedding

   
   

(c)
'He cannot choose but hear' means………

1. the
   mariner was forced to hear the story of the wedding guest

   
   

2. the
   wedding guest was forced to hear the story of the mariner

   
   

3. the
   mariner had the choice of not listening to the story of the wedding
   guest

   
   

4. the
   wedding guest had the choice of not listening to the story of the
   mariner

   
   

(d)
'The sun came up upon the left, /Out of the sea came he;'This line
tells us that the ship………………….

1. was
   moving in the northern direction

   
   

2. was
   moving eastwards

   
   

3. was
   moving in the western direction

   
   

4. was
   moving towards the south

   
   

(e)
The Wedding-Guest beat his breast because…………

1. he
   could hear the sound of the bassoon

   
   

2. he
   was forced to listen to the Mariner's tale when he wanted to attend
   the wedding

   
   

3. the
   sound of the bassoon meant that the bride had arrived and the
   wedding ceremony was about to begin and he could not attend it.

   
   

4. the
   sound of the bassoon announced the arrival of the bride and the
   start of the wedding ceremony

   
   

(f)
The storm blast has been described as being tyrannous because……….

1. it
   was so fierce that it frightened the sailors

   
   

2. it
   took complete control of the ship

   
   

3. the
   storm was very powerful

   
   

4. the
   sailors were at its mercy

   
   

(g)
The sailors felt depressed on reaching the land of mist and snow
because……

1. there
   was no sign of any living creature

   
   

2. they
   felt they would die in that cold weather

   
   

3. they
   were surrounded by icebergs and there seemed to be no sign of life

   
   

4. everything
   was grey in colour and they felt very cold

   
   

(h)
The sailors were happy to see the albatross because……..

1. it
   was the first sign of life and therefore gave them hope that they
   might survive

   
   

2. it
   split the icebergs around the ship and helped the ship move forward.

   
   

3. it
   was a messenger from God and it lifted the fog and mist.

   
   

4. it
   gave them hope of survival by splitting the icebergs.

   
   

(i)
The two things that happened after the arrival of the albatross were
……

1. the
   icebergs split and the albatross became friendly with the sailors

   
   

2. the
   icebergs split and a strong breeze started blowing

   
   

3. the
   ship was pushed out of the land of mist and the ice melted.

   
   

4. the
   albatross started playing with the mariners and ate the food they
   offered.

   
   

(j)
'It perched for vespers nine' means………

1. the
   ship stopped sailing at nine o'clock every day

   
   

2. the
   albatross would appear at a fixed time everyday.

   
   

3. the
   albatross would sit on the sail or the mast everyday

   
   

4. the
   albatross was a holy creature

   
   

(k)
'God save thee, ancient Mariner, /From the fiends that plague thee
thus!- Why look'st thou so?' means……….

1. the
   mariner wanted to know why the wedding guest was looking so
   tormented

   
   

2. the
   wedding guest wanted to know why the mariner was looking so
   tormented

   
   

3. the
   wedding guest wanted to know whether some creatures were troubling
   the ancient mariner

   
   

4. the
   ancient mariner wanted to know whether something was troubling the
   wedding guest

   
   

If the absolute refractive index of water is $\frac{4}{3}$ and that of glass is $\frac{3}{2}$. Find the refractive index of glass with respect to water.

What is the reason for the occurence of hypermetropic defect?

Ocean thermal energy taps:

How much heat energy is required to raise the temperature of unit mass of substance by $1^{\circ }C$?

A beam of protons with a velocity of $4\times {10}^5\text{m}/\text{s}$ enters a uniform magnetic field of $B=0.3\text{T}$. The velocity makes an angle of ${60}^{\circ }$ with the magnetic field. Find the pitch of the helix ?

Which of the figure correctly shoes the position of the centre of curvature of the mirror?

An object placed 4 cm in front of a converging lens produces a real image 12 cm from the lens. (a) What is the magnification of the image ? (b) What is the focal length of the lens ? (c) Draw a ray diagram to show the formation of image. Mark clearly F and 2F in the diagram.

What is the function of anaerobic micro-organisms such as anaerobic bacteria in a biogas plant?

A light and a heavy object have the same momentum. Which one of the following statements are correct regarding the kinetic energy of these two objects?

State whether the following statements are true or false. If false, give the correct statement.​

​(a) Forests influence climate, water cycle and air quality.

State whether the following statements are true or false. If false, give the correct statement.​

​(b) In a forest, trees form the uppermost layer, followed by herbs. The shrubs form the lowest layer of vegetation.​



(3)

State whether the following statements are true or false. If false, give the correct statement.​

​(c) The forest keeps on growing and changing and can regenerate.​

​(4)

State whether the following statements are true or false. If false, give the correct statement.​

​(d) Forests protect the soil from erosion.

1 A current flows through an infinitely long straight wire. The magnetic field produced at a point 1 m away from it is

Identify the part of the plant shown in the images below.