UNIT TEST 190802

CLASS-9

§  For what value of m is x³ – 2mx² + 16 divisible by x + 2?

§   If x + 2a is a factor of x5 – 4a2 x3 + 2x + 2a + 3, find a.

§  The length of each side of an equilateral triangle having an area of 9 cm² is

§  The edges of a triangular board are 6 cm, 8 cm and 10 cm. what is the cost of painting it at the rate of 9 paisa per cm² is.

§  What is sound? Write about longitudinal and transverse wave. Explain in 100 words.

CLASS-  8

Ø  If 60% people in a city like cricket, 30% like football and the remaining like other games, then what per cent of the people like other games? If the total number of people are 50 lakh, find the exact number who like each type of game.

Ø  A shopkeeper purchased 200 bulbs for Rs 10 each. However 5 bulbs were fused and had to be thrown away. The remaining were sold at Rs 12 each. Find the gain or loss %.

Ø  Arun bought a pair of skates at a sale where the discount given was 20%. If the amount he pays is Rs 1,600, find the marked price.

Ø  List sources of noise pollution in your surroundings.

Ø   Explain in what way noise pollution is harmful to humans.

CLASS- 7

Ø  What is commutative property?

Ø  What is closer property?

Ø  What is associative property?

Ø    In the given figure, the arms of two angles are parallel. If ∠ABC = 70® , then find

(A.) ∠DGC      (B.)∠DEF

CLASS - 6 

·         {25+22+(6÷2+2)÷5}

·         [64+{28×6+12-(12+8)}]

·         [28+12+36×25+250]

·         What is commutative property?

·         What is closer property?