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An air bubble is present in a glass $(\mu$ = 1.5) at a distance of $3\text{cm}$ from the curved convex surface of radius $5\text{cm}$. Position of the image of bubble is

($\mu$ is refraction index)

Distinguish between

(1) Myopia and Hypermetropia

(2) Convex mirror and concave mirror

A rolling wheel having 200 J of KE strikes a fixed box of mass 500 g. What is the rise in temperature of the box if all the KE of wheel is transferred as heat Energy to the box? (specific heat capacity of material of the box = $100J/kg{}^{\circ }C$)

Ground water will not be depleted by ___.

A thin, symmetric double-convex lens of power $P$ is cut into three parts A, B and C as shown. Select the correct option.

Why does an astronaut feel weightlessness in a satellite?

How will the magnitude of magnification change if an object placed at the centre of curvature is moved towards the focus?

While charging the lead storage battery, ………

Energy released in the fission of a single ${}_{92}{\text{U}}^{235}$ nucleus is $200\text{MeV}$. The fission rate of a ${}_{92}{\text{U}}^{235}$ fuel reactor operating at a power level of $5\text{W}$ is $1.56\times {10}^{5.5k}{\text{s}}^{-1}$. The value of $k$ is -

The front wheels of a wagon are 2π metre in circumference and the rare wheels are 3π metre in circumference. When the front wheels have made 10 more revolutions than the rare wheels, how many metres has the wagon travelled?

The blue colour of the sky is due to ____ of light.

Now, read the following telephone conversation which took place between Radhika and Gaurish. As Gaurish wishes to leave home immediately, he will not be able to meet his parents who have gone to the market. He leaves a message for his parents. Write the message for Gaurish in not more than 40 words.

Radhika : Hello, Is that Mr. Saxena’s residence.

Gaurish : Yes.

Radhika : May I speak to Mr. Saxena? I am Radhika, the roommate of his daughter, Nidhi.

Gaurish : Papa is not at home as he has gone to the market. Is everything O.K. with Nidhi? I’m her brother, Gaurish.

Radhika : I'm sorry to inform you that Nidhi received an electric shock and is admitted in Sanjeevani Hospital.

Gaurish : Oh! How did it happen?

Radhika : She was switching on the desert cooler when she received a shock and fell down unconscious. She was rushed to the hospital immediately. She is conscious now and wants to meet you and her parents.

Gaurish : Thank you very much for informing us. I’ll leave for the hospital immediately.

Radhika : That’s all right, Bye.

Gaurish : Bye.

The middle finger in Fleming’s right-hand rule represents the direction of which quantity?

Differentiate cilliary muscles depending upon its relaxed or contracted positions. [3 MARKS]

A ray of light from a denser medium strikes a rarer medium at angle of incidence $i$ as shown in the figure. The reflected and refracted rays make an angle of ${90}^{\circ }$ with each other. The angles of reflection and refraction are $r$ and $r^{\prime }$ respectively. The critical angle is

On
the basis of your understanding of the poem, answer the following
questions by ticking the correct choice

(a)
When the mirror is being described as being 'unmisted by love or
dislike' we understand that the mirror is

1. not
   misted

   
   

2. not
   prejudiced

   
   

3. has
   four angles

   
   

4. silver
   in colour

   
   

(b)
The other word for 'contemplation'
is………..

1. contempt

   
   

2. meditation

   
   

3. mediation

   
   

4. thoughtful

   
   

(c)
When the mirror says 'it
has no preconceptions' it
means that:

1. it
   reflects back an image objectively

   
   

2. it
   modifies an image as it reflects it

   
   

3. it
   beautifies an image as it reflects it

   
   

4. it
   gives a biased view of a person/object

   
   

(d)
The mirror has been called 'a
four-cornered god' because:

1. it
   is square shaped

   
   

2. like
   God it watches you unbiased and fair from all four angles

   
   

3. it
   reflects back all that it sees

   
   

4. it
   never stops reflecting

   
   

(e)
The 'speckles'
refer
to:

1. a
   pink object

   
   

2. the
   opposite wall which has spots on it

   
   

3. a
   person with pink pimples

   
   

4. pink
   spots in general

   
   

(f)
The phrase 'agitation
of the hand' suggests
that the person is:

1. Very
   ill

   
   

2. Very
   upset

   
   

3. Very
   angry

   
   

4. Very
   happy

   
   

(g)
By saying 'Now
I am a lake' the
narrator wants to show that

1. the
   poem is not only about external beauty but also the inside of a
   person

   
   

2. the
   lake can also reflect surfaces

   
   

3. the
   depth of the lake is important

   
   

4. the
   lake does not show as exact an image as a mirror

   
   

A gate with two inputs (A,B) and one output (Y) is implemented using a $4\times 1$ MUX as shown in the figure below.





Then the funciton ${}^{\prime }{Y}^{\prime }$ is equal to

The refractive indexes of four substances P, Q, R and S are 1.77, 1.50, 2.42 and 1.31 respectively. When light travelling in air is incident on these substances at equal angles, the angle of refraction will be the maximum in : (a) substance P (b) substance Q (c) substance R (d) substance S

A wavefront expressed by $x+y+z=4$ is incident on a plane mirror which is lying parallel to $xy-$ plane. Which of the following unit vectors correctly represent the direction of reflected ray ?

The maximum number of 40W tube lights connected in parallel which can safely run from a 240V supply with a 5A fuse is

(a) 5 (b) 15 (c) 20 (d) 30

The step (S) necessary for determing the percentage of water absorbed by raisins is/are:

An electric bulb is marked 220 W and 250 V. if the supply voltage drops to 180 V. calculate the light and heat energy produced in 10 minutes

Natural breeding - Selected animals picked for their special traits are made to live together in enclosures, and breed naturally.

In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find the efficiency.

State one way of increasing the frequency of a note produced by an air column.

An object is 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is : (a) less than 100 mm (b) between 100 mm and 200 mm (c) exactly 200 mm (d) more than 200 mm

How is tidal energy harnessed?

If a ray of light travelling from denser to rarer medium reflects back to the denser medium.This phenomenon is called as:

Which of the following represents a circuit diagram for the given circuit? Here switch ‘a’ is ON and switch ‘b’ is OFF.

How are focal length and radius of curvature connected?

A concave mirror is ........................ mirror

Which one of the following is true in the case of discharge lamps?