Variable and Constant

Q.

Question 20

$\frac{4}{2}=2$ denotes a

(a) numerical equation

(b) algebraic expression

(c) equation with a variable

(d) false statement

Q.

Anu and Meena are sisters. Anu is $5$ years younger than Meena. Can you write Anus age in terms of Meenus age? Take Meenus age as $x$ years.

Q. A variable is a symbol representing a quantity whose value is unknown. True or false?

1. True
2. False

Q.

Which of the following is a variable?

1. Number of days in a week
2. Temperature of a place in a day at different times
3. Number of months in a year
4. 5

Q.

What is the degree of the expression $5abc-3a^{2}bc$?

1. 4

2. 5

3. 3

4. 2

Q.

Which of the following is a variable?

1. $a$

2. $5$

3. $\frac{13}{5}$

4. $\pi$

Q.

Change the following statements using expressions into statements in ordinary language.
i) Tony puts q marbles on the table. He has 8q marbles in his box.
ii) Jaggu is z years old. His uncle is 4z years old and his aunt is (4z – 3) years old.

Q.

A symbol that can be assigned for various values is called variables.

1. True
2. False

Q. The variable among the following is .

1. $5$
2. $a$
3. $\frac{13}{5}$
4. $\pi$

Q.

The variable in the expression $9x-36$ is $x$.

1. True

2. False

Q.

Mira is three years older than jyoti. Form an expression for their ages $5$ years ago.

Q. Among the options given below, can be used as a variable.

1. $\frac{13}{5}$
2. $\pi$
3. $a$
4. $5$

Q.

Radha is drawing a dot Rangoli (a beautiful pattern of lines joining dots) with chalk powder. She has 9 dots in a row. How many dots will her Rangoli have for r rows?

Q.

The variable in the expression $9x+32$ is ___.

1. x

2. 9

3. 32

4. +

Q.

Change the following statements using expressions into statements in ordinary language.

(iii) In an arrangement of dots, there are r rows. Each row contains 5 dots.

Q.

Tina never understood why her uncle Ramses, an astronomer spends most of his time star gazing. To this, Ramses explained her saying that the position of a star seems to be changing with time. Ramses makes four statements in accordance with the practical application of what Tina studied in class. Which of the following is true with respect to stars and their possibilities of positioning?

1. Position of stars is variable

2. Position of stars is constant

3. Position of stars is a factor

4. There is no such analogy

Q.

The branch of mathematics in which we study the use of letters to write rules and formulas in a general way is known as ___

Q. Tina never understood why her uncle Ramses, an astronomer spends most of his time star gazing. To this, Ramses explained her saying that the position of a star seems to be changing with time. Ramses makes four statements in accordance with the practical application of what Tina studied in class. Which of the following is true with respect to the stars and their possibilities of positioning?

1. There is no such analogy

2. Position of the stars is variable

3. Position of the stars is a factor

4. Position of the stars is constant

Q.

What is the degree of the expression $5abc-3a^{2}bc$?

1. 4

2. 3

3. 2
4. 5

Q.

Which of the following expressions are formed with numbers only?

1. $30-n$

2. $\left(5\times 10\right)-7$

3. $6(18-3)+5\times 3$

4. $\left(6\times 15\right)-\left(5\times 8\right)+x$

Q. Are we allowed to use any variables in the question??

Q. Pick the Variables from the following.

1. 14
2. m
3. +
4. 0

Q.

The branch of mathematics in which we study the use of letters to write rules and formulae in a general way is known as ___

Q.

Which of the following is true with respect to stars and their possibilities of positioning?

1. Position of stars is a factor

2. There is no such analogy

3. Position of stars is variable

4. Position of stars is constant

Q. Which of the following is a variable?

1. Number of days in a week
2. 5
3. Temperature of a place in a day at different times
4. Number of months in a year

Q.

What is a variable?

1. A constant

2. An operator

3. A mathematical statement

4. A symbol used to represent an unknown quantity in an expression

Q. How many variables are there in the expression given below?

$4x+5y+3$

Q. Which of the following is a variable?

1. Number of months in a year
2. Temperature of a place in a day at different times
3. Number of days in a week
4. 5

Q.

Why are variables called so?

Q.

Which of the following can be used as a variable?

1. $5$

2. $\frac{13}{5}$

3. $\pi$

4. $a$