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VII CBSE Chapter Fractions

28/5/2013

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4 Comments

VII maths Chapter Integer Practice For Excellence

28/5/2013

38 Comments

 
CHAPTER – 1 INTEGER CBSE Class 7th 

1. At Srinagar temperature was – 5°C on Monday and then it dropped by 2°C on Tuesday. What was the temperature of Srinagar on Tuesday? On Wednesday, it rose by 4°C. What was the temperature on this day?

2. A plane is flying at the height of 5000 m above the sea level. At a particular point, it is exactly above a submarine floating 1200 m below the sea level. What is the vertical distance between them?

3. Mohan deposits Rs 2,000 in his bank account and withdraws Rs 1,642 from it, the next day. If withdrawal of amount from the account is represented by a negative integer, then how will you represent the amount deposited? Find the balance in Mohan’s account after the withdrawal.

4. Rita goes 20 km towards east from a point A to the point B. From B, she moves 30 km towards

west along the same road. If the distance towards east is represented by a positive integer then, how will you represent the distance travelled towards west? By which integer will you represent her final position from A?

5. Write a pair of integers whose sum gives

(a) a negative integer      

(b) zero

(c) an integer smaller than both the integers.

(d) an integer smaller than only one of the integers.

(e) an integer greater than both the integers.

6. Write a pair of integers whose difference gives

(a) a negative integer.  

(b) zero.

(c) an integer smaller than both the integers.

(d) an integer greater than only one of the integers.

(e) an integer greater than both the integers.

7. Write down a pair of integers whose

(a) sum is –3     

 (b) difference is –5 

(c) Difference is 2

(d) sum is 0

8. Write down a pair of integers whose:

(a) sum is –7             


(b) difference is –10

(c) sum is 0

9. Write a pair of negative integers whose difference gives 8.

10. Write a negative integer and a positive integer whose sum is –5.

11. Write a negative integer and a positive integer whose difference is –3.

12. Find: 4 × (– 8), 8 × (–2), 3 × (–7), 10 × (–1) using number line.

13. Verify (–30) × [13 + (–3)] = [(–30) × 13] + [(–30) × (–3)]

14. In a class test containing 15 questions, 4 marks are given for every correct answer and (–2) marks are given for every incorrect answer. (i) Gurpreet attempts all questions but only 9 of her What will be her score?

15. An elevator descends into a mine shaft at the rate of 5 metre per minute. What will be its position after one hour? If it begins to descend from 15 m above the ground, what will be its position after 45minutes?

16. A certain freezing process requires that room temperature be lowered from 40°C at the rate of 5°C every hour. What will be the room temperature 10 hours after the process begins?

17. In a test (+5) marks are given for every correct answer and (–2) marks are given for every incorrect answer.

(i) Radhika answered all the questions and scored 30 marks though she got 10 correct answers.

(ii) Jay also answered all the questions and scored (–12) marks though he got 4 correct answers. How many incorrect answers had they attempted?

18. A shopkeeper earns a profit of Re 1 by selling one pen and incurs a loss of 40 paise per pencil while selling pencils of her old stock.

 (i) In a particular month she incurs a loss of Rs 5. In this period, she sold 45 pens. How many pencils did she sell in this period?

 (ii) In the next month she earns neither profit nor loss. If she sold 70 pens, how many pencils did she sell?

19. The temperature at 12 noon was 10°C above zero. If it decreases at the rate of 2°C per hour until midnight, at what time would the temperature be 8°C below zero? What would be the temperature at mid-night?

20. An elevator descends into a mine shaft at the rate of 6 m/min. If the descent starts from 10 m above the ground level, how long will it take to reach – 350 m.

21. Evaluate each of the following:

(a) (–30) ÷ 10 (b) 50 ÷ (–5) (c) (–36) ÷ (–9)

(d) (– 49) ÷ (49) (e) 13 ÷ [(–2) + 1] (f ) 0 ÷ (–12)

(g) (–31) ÷ [(–30) + (–1)]

(h) [(–36) ÷ 12] ÷ 3 (i) [(– 6) + 5)] ÷ [(–2) + 1]

22. Find the product, using suitable properties:

(a) 26 × (– 48) + (– 48) × (–36) (b) 8 × 53 × (–125)

(c) 15 × (–25) × (– 4) × (–10) (d) (– 41) × 102

(e) 625 × (–35) + (– 625) × 65 (f) 7 × (50 – 2)

(g) (–17) × (–29) (h) (–57) × (–19) + 57

 23. Verify the following:

(a) 18 × [7 + (–3)] = [18 × 7] + [18 × (–3)]

(b) (–21) × [(– 4) + (– 6)] = [(–21) × (– 4)] + [(–21) × (– 6)]

24. A cement company earns a profit of Rs 8 per bag of white cement sold and a loss of Rs 5 per bag of grey cement sold.

(a) The company sells 3,000 bags of white cement and 5,000 bags of grey cement in a month. What is its profit or loss?

(b) What is the number of white cement bags it must sell to have neither profit nor loss, if the number of grey bags sold is 6,400 bags.

25. Find each of the following products:

(i) (–18) × (–10) × 9 (ii) (–20) × (–2) × (–5) × 7 (iii) (–1) × (–5) × (– 4) × (– 6)

MCQ’S

1. In addition and subtraction of two integers , sign of the answer depends upon

(a) Smaller number        (b) Their difference

 (c) Their sum                (d) Greater numerical value

2. Sum of two negative number is always

(a) Positive        (b) Negative      (c) 0             (d) 1

3. Sum of two Positive number is always

(a) Negative      (b) Positive        (c) 1             (d) 0

4. Identify the property used in the following:

2 x 13 + 8 x 13 = ( 2+8 ) x 13

(a) Commutative               (b) Closure            (c) Associative                     (d) Distributive

5. Which number is multiplicative identity for the whole numbers

(a) 0     (b) 1                 ( c) 2                (d) 3

6. Which property is reflected in the following?    7 x 5 = 5 x 7

(a) Closure                    (b) Commutative        (c) Associative             (d) Distributive

7. Which of the following statement is true

(a) 7 ÷ 0 = 7           (b) 7 ÷ 0 = 0           (c) 7 ÷ 0 = 0 ÷ 7                (d) 0 ÷ 7 = 0

8. Product of two negative integers is always

(a) Always negative                            (b) Always positive

(c) Either positive or negative      (d) 0

9. The integer whose product with – 1 is – 40 is

(a) 20       (b) – 20           (c) – 40          (d) 40

10. Absolute value of – 11 is 
(a) – 10         (b) 10             (c) 11          (d) 0

38 Comments

Heat and Temperature 7th CBSE Physics Question with Solution formative

21/5/2013

7 Comments

 
   Heat and Temperature 7th CBSE Physics

Check point-01 [Formative Assessments]

1. Fill in the blanks

a. Substances which produce large amount of heat on burning are called Fuel.

b. Very low temperature reduce the rate of the growth of bacteria

c. Degree of hotness of a body is called its temperature.

d. Hotness and coldness are comparative term, not absolute.

e. Change of the state is caused by heating or cooling a substance.

f. First stem engine invented by James watt based on the principal of Transformation of energy.

2. What type of energy change takes place in:

a. Thermal power Station: heat energy ®Electrical Energy

b. Nuclear power station: Nuclear energy ® Heat energy ® Electrical Energy

Check point-02 [Formative Assessments]

Fill in the blanks

a. Sir Thomas Clifford Albutt in 1866 invented Clinical thermometer.

b. Thermometer is used to measure temperature.

c. The most commonly use scale to measure temperature is the Celsius  scale

d. In the Celsius scale freezing point of water is 00 C   and boiling point is 1000C

e. Lab thermometer can measure temperature safely from 00 C to 1000C.

f. The average body temperature is 370C or (98.40C)

g. The highest reading on clinical thermometer is 420C.

h. An object expands on heating and contracts on cooling.

i. The heat can cause change of state in object.

State True and False:

a. A clinical temperature measure temperature up to 1200C [F]

b. A laboratory thermometer has kink in its capillary [F]

c. The degree of hotness cannot be estimated by touching and feeling [T]

d. Disposing of broken thermometer is common trash is harmful to environment [T]

Practice: Answer these Questions:

1. Q. Does every human being have exactly the same body temperature?

Answer: No. every human being have little variation in body temperature

2.  Q. What is the range of clinical thermometer?

Answer: 350C to 420C

3. Q. Why does not a clinical thermometer contain marking above 420C?

Answer: This is because no human can survive above 420C.

4. Q. Can a clinical thermometer used to measure temperature of boiling milk? Give reason?

Answer: No, because boiling point of milk is more than 1000C which is above highest marking of clinical thermometer.

5. Q. Why is the stem of thermometer made up of glass?

Answer: The stem of thermometer made up of glass so that reading became easy

6. Q. Paper and dry cloth catch fire easily. Why are they not used as a fuel?

Answer: Paper and dry cloth catch fire easily but cannot produce large amount of heat so they are not used as a fuel.

7. Q. Why a laboratory thermometer cannot be used to measure body temperature?

Answer:  Ans: There is no ‘kink’ in laboratory thermometer. Therefore the temperature will fall as soon as we remove the thermometer from the mouth and we will not be able to measure the correct temperature of the body.

8. Q. Why kink is provided in the capillary of clinical thermometer?

Answer: kink is provided in the capillary of clinical thermometer to prevent level of  mercury from falling back.

9. Q. Why drinking water recommended to boil and filtered before using?

Answer: Drinking water contain gem that is fatal for body so we recommended to boil and filtered before using water  to kill bacteria.

10. Q. What are the differences between clinical and lab Thermometer?

Answer: (a) A clinical thermometer reads temperature from 35OC to 42OC, while a laboratory thermometer ranges between –10OC to 110OC.

(b)  Clinical thermometer has a kink near the bulb while there is no kink in laboratory thermometer.   

11. Q. How does digital thermometer measure temperature?

Answer:  Digital thermometers provide an easy-to-read, LCD display. The heat sensor within the digital thermometer reads the temperature of body  and displays it.

12. Q. Why liquid mercury used in thermometer?

Answer: Mercury is used in thermometer because of following reasons:

i) It does not stick to the walls of capillary tube.

ii) Its silvery shine helps us to see temperature accurately.

iii) Its expansion is uniform.

iv) It does not vaporize easily.

13. Q. Why by touching and feeling the hotness of a body is not sufficient to measure temperature?

Answer: Sometime touching and feeling the hotness of a body give us wrong result so touching and feeling the hotness of a body is not sufficient to measure temperature.

14. Q.  State two phenomenons involve the transformation of heat energy?

Answer:

15. Q. How is life of bacteria affected by heat?

Answer: Bacteria cannot grow and multiply at high temperature.

16. Q. State precautions taken while using clinical thermometer?

Answer: We should take following precautions while while using clinical thermometer:-

i)It should be washed before and after using with an antiseptic solution.

ii) We should check or ensures that the mercury level should be 35 degree Celsius before using it.

iii)The reading should be taken while keeping the level of mercury along the line of sight.

iv)W e should not hold the thermometer by its bulb while reading it.

v) We should handle the thermometer with care, as it is breakable.

17. Q. State precautions taken while using Laboratory thermometer?

Answer: precautions taken while using Laboratory thermometer are

a. Bulb of Laboratory thermometer must be in contact of object properly.

b. Reading should be taken without removing from its position.

c. Eyes should be at the vertical level

d. Do not used to measure temperature below - 100C and above 1100C.

18. Q. Why are bottle containing liquid left with some space at the top?

Answer: Bottle containing liquid is left with some space at the top to provide space for expansion of liquid on heating.

19. Q. Why are huge bridge provided with flexible joint?

Answer: flexible joint in huge bridge allow expansion in summer and protect from bending.

20. Define Heat and Energy and temperature.

Answer: According to Rumford and James Prescott, Heat is a form of energy that is known as Thermal Energy. Energy in a substance is due to movement of its molecules.              

Energy is capacity to do work. Energy is neither created nor destroyed it can only transformed [changed] one form to another.

 Temperature is a measure of the degree of hotness and coldness of an object. S.I unit of Temperature is Kelvin. Other Units are degree Celsius and degree Fahrenheit

Q. (iv) Why digital thermometers are used these days

Ans.:  Mercury is a poisonous metal if a thermometer breaks in mouth. . To overcome this, digital thermometers are used these days.

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    • 10th science Term II
      • Carbon and Its Compounds
      • Periodic Classification of Elements
      • Light - Reflection and Refraction
      • The Human Eye and the Colourful World
      • X Biology Term-II
        • How Do Organisms Reproduce ?
        • Heredity and Evolution
        • Our Environment
        • Management of Natural Resource
    • 10th Maths Term I
      • X Real Numbers
      • X Linear Equations in Two Variables
      • X Polynomials
      • X Similar Triangles
      • X Trigonometry and Identities
      • X Statics(Mean,median and Mode)
    • 10th Maths Term II
      • 10th Quadratic Equations
      • 10th Arithmetic Progressions
      • 10th Co-Ordinate Geometry
      • 10th Height and Distance
      • 10th Circles
      • 10th Area Related to Circles
      • 10th Surface Areas and Volumes
      • 10th Probability
      • 10th Constructions
    • 10th Social Science
      • 10th History and Geography
      • 10th Civics and Economics
    • 10th CBSE English
    • 10th Solved Assignments
  • CLASS 9
    • 9th Science term I
      • IX Motion and Rest
      • IX Force and Laws of motions
      • IX Gravitation
      • IX Matter in our surrounding
      • IX Is Matter around Us Pure
      • IX Biology Term-1
        • Cell structure n function class9
        • Tissue class9
        • Improvement in food resources class9
    • 9th Science term II
      • Atoms and Molecules
      • Structure of the Atom
      • Thrust and Pressure
      • Work and Energy
      • Sound
      • IX Biology Term-2
        • Diversity in Living Organisms
        • Natural Resources
        • Why Do We Fall ill ?
    • 9th Maths term I
      • IX Number system
      • IX Polynomials
      • IX Introduction to Euclid Geometry
      • IX Lines and Angles
      • IX Triangles
      • IX Coordinate geometry
      • IX Area of triangles by Heron's formula
    • 9th Maths term II
      • Linear equations in two variables
      • Quadrilaterals
      • Area of Parallelogram and Triangle
      • Circle
      • Surface Areas and Volumes
      • Constructions
      • Statistics
      • Probability
    • IX Social Science
      • 9th Social Science Term-1
      • 9th Social Science Term-2
    • IX English and Hindi
    • CBSE ASL Corner
  • IX Sample Papers
    • 9th Sample Paper 2018
    • IX Sample Papers SA-I
      • 9 Mathematics SA1
      • 9 Science SA1
      • 9 Social Science SA1
      • 9 English and Hindi SA1
    • IX Sample Paper SA-II
      • Mathematics
      • Science
      • Social Science
      • English Hindi Sanskrit
    • IX Practical skill Science
  • X Sample Papers
    • 10th Sample Paper 2018
    • X Sample Paper SA-I
      • X Mathematics SA1
      • X Science SA1
      • X Social Science SA1
      • 10th English sa-1 paper
      • 10th Hindiand sanskrit sa-1 paper
    • X Sample Paper SA-II
      • Mathematics
      • Science
      • Science Practicals MCQ
      • Social Science
      • Hindi English and Sanskrit
  • CLASS 8
    • 8th Science
      • Class 8 Physics
        • Force Pressure and Frictions
        • Sound
        • Chemical Effects of Electric Current
        • Refraction of Light and Our Eyes
        • Some Natural Phenomenon
        • Stars and the Solar System
      • Class 8 Chemistry
        • Synthetic fibre and Plastics
        • Metals and Non-Metals
        • Combustion ,Flame and Fuel
        • Coal Petroleum, Natural Gases
        • Air and Water Pollution
      • Class 8 Biology
        • Crop Production and Management
        • Microorganisms friend and foe
        • Cell structure and functions
        • Reproduction in animals
        • Reaching the Age of Adolescence
        • Conservation of plants and animals
    • Class 8 Mathematics
      • Algebra
        • Rational Number
        • Factorization
        • Square and Square Roots
        • Algebraic Expression
        • Exponent and Power
        • Linear Equations
      • Commercial math
        • Unitary Methods
        • Percentage
        • Profit and Loss
        • Discounts & Sales Tax
        • Compound Interest
      • Geometry/Mensuration
        • Quadrilateral
        • Practical Geometry
        • Perimeter and Area
        • Data Handling
        • Introduction of Graphs
    • Class 8 Sample papers
      • 8th Question paper sa1
      • 8th Question paper sa2
  • CLASS 07
    • class 7 Science
      • class 7 Physics
      • class 7 chemistry
      • class 7 Biology
      • 7th Science Test Papers
      • 7th Science Solved Papers
    • class 7th Maths
      • Class 07 Maths Tem-I
      • Class 07 Maths Tem-II
  • Class 06
    • 6th Maths
    • 6th science
      • 6th Science Term-1
      • 6th Science Term-2
  • NCERT Solutions
    • X Science and Maths
    • IX Science and Maths
  • Class 11 - 12
    • 12th Sample paper
    • 11th Study Material
      • 11th Physics
      • 11th Chemistry
      • 11th Maths
    • 12th Study Material
  • NTSE
    • NTSE SAMPLE PAPER