Important Practice Question Class 10 For Math and Science With Solution

                                                               

 

                                                               11 September 2020 

1.  If sin θ + cos θ = √3  , then prove that tan θ + cot θ = 1

Solution 1

 

Solution 2 

2.  The lower window of a house is at a height of 2 m above the ground and its upper window is 4 m vertically above the lower window. At a certain instant, the angles of elevation of a balloon from these windows are observed to be 60 Degree and 30 Degree, respectively. Find the height of the balloon above the ground.

3. What is Joule’s heating effect? List its four applications in daily life.

           

                                                               

4. What is electrical resistivity? In a series of an electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?