Std.7 Math (PRACTICE PAPER)

                                                             PRACTICE PAPER

Q.I) Choose the correct alternative with the alphabet against the sub-question number:     04 marks

1.The LCM of 4 and 5 is ________

A) 20     B) 15      C) 5

2.If the sum of the measures of two angles is 90° then they are known as ........... angles.

     A)  supplementary    B)  complementary     C)  zero

3) The quotient of two negative integers is a ........... integer.

A) positive  B) negative  C)  infinite 

4. Two numbers which have only 1 as a common factor are said to be ______ number.

A) composite number  B) co-prime number  C)  small number

Q) II Attempt the following  (Any 3)                                                                                 06 marks

1. Divide:  A)  (- 98) ÷ (- 14)      B)  (-10) ÷  (-10)

2.Find the LCM of 15 and 30

3.The product of two digit numbers is 765 and the GCD = 3. What is their LCM ?

4. Name the pairs of opposite rays in the figure alongside.

Q.III)   Solve (Any 2)                                                                                                      06 marks

1.Write the measures of the supplements of the angles given below

    a) 30° b) 60°  c) 40°

2.a) Which number is neither a prime nor a composite number.?

   b) Which are the even prime numbers?

   c) Say true or false.

      2 is the HCF of any two consecutive even numbers. 

         

3.Observe the figure and complete table.

Q.IV) Solve (Any 1)                                                                                                           04 marks

1.Write four divisions of integers such that the fractional form of each will be 24/5.

2. A)Draw a number line and show the following numbers on number line

           -3 , 2 

    B) Find HCF by the division method and reduce to the simplest form.

            161/69

Std.7 Practice Paper (Science)

                                                           PRACTICE PAPER 

_________________________________________________________________________________________

Q.1 A Choose the correct alternative and write it along with its allotted alphabet. [2 marks]

        1) Plant food is produced by a special process known as  __________  

            (a) photosynthesis   (b) evaporation  (c) condensation 

        2) The part that grows from inside the seed towards the soil is called the __________

            (a) radical (b) herbs (c) plumule

B] Answer the following:                                             [2 marks]

        1) True or False:

             Androecium is a male reproductive organ.

        2)  Match the following:

Q.2 A. Give scientific reasons (Any 1)     [2marks]

       1) Why do living organisms need nutrition ?

       2) Corn is an example of monocot seed.

       3) Nowadays, food is served buffet style during large gatherings.

Q.2 B] Answer the following (Any 2)        [4 marks]

      1) Draw a neat and labelled diagram of parts of leaf.

      2) Name the following:(Who am I ?)

       i) I transport minerals and water from the root to all aerial parts of the plant. 

       ii) I transport the food (glucose, etc.) from the leaves to other parts of the  plant where it is either consumed or stored..

 3) Complete the table:

Q.3) Answer the following (Any 2) [6 marks]

     1) Choose the appropriate word from the bracket and rewrite the paragraph.

(host ,chlorophyll ,Scavengers, photosynthesis, parasitic, decomposers, saprophytic, insects.)

Due to the absence of ........., the cuscuta is completely dependent on the ........ plant. Hence, it is said to be a completely ........ plant.

Plants which obtain the food from dead and decaying bodies of other organisms are called ...... plants.

........ obtain their food from dead bodies of animals, for example, vulture, 

crow, hyena, etc.  and. ....... are some microbes which obtain their food by decomposing the dead bodies of organisms or other materials. 

  2) Write a note on Pasteurisation.

  3) Describe any three parts of flower.

4. Classify according to food-type.

cow, lion, sparrow, frog, cockroach, tick.

Q.4) Answer the following (Any 1)          [4 marks]

1.Write the practical tests to find out if food has been adulterated or not.

For Milk,Rava,Turmeric powder and Red chilly powder.

2. Identify the parts of stem and write any two functions of stem.

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Poster making competition

Dear Students,

SAGH is glad to announce Poster making and slogan writing competition on the occasion of swastha bharat abhiyan.

As you are aware about harmful effects of intoxicant material, highlighting the health and other risks associated with tobacco use.

On this occasion of great significance, we are glad to announce this competition to explore the creative instinct of students from class7th to 8th and encourage them to portray their ideas on “health and other risks associated with tobacco use”.

PARTICIPATION GUIDELINES

The creative participation is open for students of classes as per following two categories;(Only SAGH, Chembur)

1. 7th

2. 8th

LANGUAGE

Creative entries must be written in English,Marathi or Hindi only.

IMPORTANT DATES

• Start Date: 12th July 2023

• Last Date: 14th July, 2023

MODE OF SUBMISSION:

• A3 or A4 sheet may be used for Poster.

• Write-up text (slogan) of the Poster should be submitted in readable font of English/Hindi/Marathi and it should be written on the poster itself.

Thank you

Image credit:Internet 

Std. 8. Force and Pressure

Question 1:

Write the word in the blank space.
A. The SI unit of force is_________ (Dyne, Newton, Joule)
B. The air pressure on our body is equal to __________ pressure (Atmospheric, sea bottom, space)
C. For a given object, the buoyant force in liquids of different ________ is__________ (the same, density, different, area)
D. The SI unit of pressure is_______ (N/m³ , N/m², kg/m², pa/m²) 

ANSWER:

A. The SI unit of force is Newton.
B. The air pressure on our body is equal to atmospheric pressure.
C. For a given object, the buoyant force in liquids of different density is different.
D. The SI unit of pressure is N/m².

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Question 2:

Make a match 

A group	B group
1. Fluid	a. Higher pressure
2. Blunt knife	b. Atmospheric pressure
3. sharp needle	c. Specific gravity
4.Relative density	d. Lower pressure
5. Hecto pascal	e. Same pressure in all directions

ANSWER:

A group	B group
1. Fluid	e. Same pressure in all directions
2. Blunt knife	d. Lower pressure
3. sharp needle	a. Higher pressure
4. Relative density	c. Specific gravity
5. Hecto pascal	b. Atmospheric pressure

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Question 3:

Answer the following questions in brief.
A. A plastic cube is released in water.  Will it sink of come to the surface of watet?
B. Why do the load carrying heavy vehicles have large number of wheels?
C. How much pressure do we carry on our heads? why don't we feel it?

ANSWER:

(a) The plastic cube is going to float on the surface of water as its density is less than that of water.

(b) We know, $\mathrm{Pressure}=\frac{\mathrm{Force}}{\mathrm{Area}}$
So, greater the area of contact between two surfaces, lesser will be the pressure. So, the load carrying heavy vehicles have large number of wheels so that the pressure on the road is reduced due to larger contact area. Also, using large number of wheels ensures that the force due to the load is shared among the tyres and no single tyre is under stress.

(c) We carry atmospheric pressure of about 10⁵ Pa on our heads. We don't feel it because this atmospheric pressure is balanced by the pressure created by the air and blood inside our body. 

Page No 22:

Question 4:

Why does it happen?
A. A ship dips to a larger depth in fresh water as compared to marine water.
B. Fruits can easily be cut with a sharp knife.
C. The wall of a dam is broad at its base.
D. If a stationary bus suddenly speeds up, passengers are thrown in the backward direction.

ANSWER:

A. The density of marine water is more than the fresh water due to which the buoyant force on the ship in marine water is more than the fresh water. Hence, the ship dips to a larger depth in fresh water as compared to marine water.

B. Since the sharp edged knife makes lesser contact with the fruits to be cut, thus the pressure exerted by it on the fruit is very large. Because of this large pressure, fruits are easily cut with a sharp knife.

C. We know pressure of liquid increases with depth. So, the wall of a dam is made broader at its base so that it is able to withstand the heavy pressure exerted by the river water.

D. If a stationary bus suddenly speeds up, passengers are thrown in the backward direction. This is because initially the whole body of a passenger inside the bus was in the state of rest. But, when the bus suddenly starts or speeds up, the lower half of the passenger's body comes in motion in the forward direction but the upper half still remains at rest due to inertia of rest. Hence, the passengers are thrown backward when a stationary bus suddenly speeds up.

Page No 22:

Question 5:

Complete the following tables.

Mass(Kg)	Volume (m3)	Density(kg/m3)
350	175	-
-	190	4

 

Density of Metal (kg/m3)	Density of water (kg/m3)	Relative Density
	103	5
8.5$\times$103	103	-

 

weight(N)	Area (m2)	Pressure(Nm−2)
-	0.04	20,000
1500	500	-

ANSWER:

We know, $\mathrm{Density}=\frac{\mathrm{Mass}}{\mathrm{Volume}}$
So, using above formula, we can find one quantity if other two quantities are given.

Mass (kg)	Volume (m3)	Density (kg/m3)
350	175	2
760	190	4

 
We know, $\mathrm{Relative} \mathrm{density} \mathrm{of} \mathrm{substance}=\frac{\mathrm{Density} \mathrm{of} \mathrm{substance}}{\mathrm{Density} \mathrm{of} \mathrm{water}}$
So, using above formula, we can find one quantity if other two quantities are given.

Density of Metal (kg/m3)	Density of water (kg/m3)	Relative Density
5$\times$103	103	5
8.5$\times$103	103	8.5

We know, $\mathrm{Pressure}=\frac{\mathrm{Force}}{\mathrm{Area}}$
So, using above formula, we can find one quantity if other two quantities are given. 

Weight (N)	Area (m2)	Pressure (N m−2)
800	0.04	20,000
1500	500	3

Page No 22:

Question 6:

The density of a metal is $10.8\times {10}^{3 }\mathrm{kg}/{\mathrm{m}}^3$. Find the relative density of the metal.

ANSWER:

Given:
Density of metal = $10.8\times {10}^{3 }\mathrm{kg}/{\mathrm{m}}^3$
We know, density of water = 1000 kg/m³
$\mathrm{Relative} \mathrm{density} \mathrm{of} \mathrm{substance} =\frac{\mathrm{Density} \mathrm{of} \mathrm{substance}}{\mathrm{Density} \mathrm{of} \mathrm{water}}$
$\mathrm{Relative} \mathrm{density} \mathrm{of} \mathrm{substance} =\frac{10.8\times {10}^3}{1000}=10.8$

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Question 7:

Volume of an object is 20 cm³ and the mass in 50 g. Density of water is 1 g cm^$-$3. Will the object float on water or sink in water?

ANSWER:

Given:
Volume of object = 20 cm³
Mass of object = 50 g
Density of object = $\frac{\mathrm{Mass} \mathrm{of} \mathrm{object}}{\mathrm{Volume} \mathrm{of} \mathrm{object}}=\frac{50}{20}=2.5 \mathrm{g}/{\mathrm{cm}}^3$
Now, we know density of water = 1 g/cm³
Since, density of object > density of water, therefore the object is going to sink in water.

Page No 22:

Question 8:

The volume of a plastic covered sealed box is 350 cm³ and the box has a mass 500 g. Will the box float on water or sink in water? what will be the mass of water displaced by the box?

ANSWER:

Given:
Volume of box = 350 cm³
Mass of box = 500 g
Density of object = $\frac{\mathrm{Mass} \mathrm{of} \mathrm{object}}{\mathrm{Volume} \mathrm{of} \mathrm{object}}=\frac{500}{350}=1.43 \mathrm{g}/{\mathrm{cm}}^3$
Now, we know density of water = 1 g/cm³
Since, density of box > density of water, therefore the object is going to sink in water.
Now, volume of liquid displaced = Volume of the object = 350 cm^{3
$$\begin{gathered} \Rightarrow \frac{\mathrm{Mass} \mathrm{of} \mathrm{liquid} \mathrm{displaced}}{\mathrm{Density} \mathrm{of} \mathrm{liquid} \mathrm{displaced}}= 350 {\mathrm{cm}}^3 \\ \Rightarrow \mathrm{Mass} \mathrm{of} \mathrm{liquid}=350\times 1=350 \mathrm{g} \end{gathered}$$}