X : Life Processes & Word Problems : Test 4

X : Life Processes & Word Problems  : Test 4             M: 23    S: 20

1.       [3] A two digit number is such that the ten's digit exceeds twice the unit's digit by 2 and the number obtained by inter-changing the digits is 5 more than three times the sum of the digits. Find the two digit number.        

2.       [3] A part of monthly hostel charges is fixed and the remaining depends on the number of days one has taken food in the mess. When a student A takes food for 20 days she has to pay Rs. 1000 as hostel charges whereas a student B, who takes food for 26 days, pays Rs. 1180 as hostel charges. Find the fixed charges and the cost of food per day.

3.       [2] Ram can row a boat 8 km downstream and return in 1 hour 40 minutes. If the speed of the stream is ,2km/h, find the speed of the boat in still water.

4.       [3] An express train takes 1 hour less than a passenger train to travel 132 km between Mysore and Bangalore (without taking into consideration the time they stop at intermediate stations). If the average speed of the express train is 11 km/h more than that of the passenger train, find the average speed of the trains.

5.       [3] Three years ago, Tom was thrice as old as Robert. Seven years hence, Tom will be twice as old as Robert will be men. Find their present ages.

6.       [3] In a class test ,the sum of Ram’s marks in Hindi and English is 30. Had he got 2 marks more in  Hindi and 3 less in English the product of the marks would have been 210. Find her marks in the two subjects

7.       [3] Rs 9,000 were divided equally among a certain number of persons. Had there been 20 more persons, each would have got Rs. 160 less. Find the original number of persons.

8.       [3] A & B are 80 km a part. A cars start from A & B. If they move in same directions  they meet in the 8 hrs & if in opposite direction , meet in 1 hr & 20 minutes find their speeds.

9.       [2] Describe the structure and functioning of nephrons.

10.    [4] Draw a diagram of the human urinary system and label it          

[ A ] (i) Kidney  (ii) Ureter (iii) Urinary Bladder (iv) Urethra                                

11.     [3] Two metallic wires A and B of the same  material are connected in parallel . Wire a has length l and radius r , wire B has a length 2l and radius 2 r . Calculate the ratio of the equivalent of wire A .

12.    [2] How is an ammeter and voltmeter connected in a circuit to measure current and voltage flowing through it ?

13.    [1]What is meant by the potential difference between two points is 1 V?

14.    [1] A current of 0.5 A is drawn by a filament of an electric bulb for 5 minutes. Find the amount of electric charge that flows through the circuit.                    

15.    [1] How much work is done in moving a charge of 2 C across two points having a pot .diff. of 12 V?

16.    [3] A 4W resistance wire is doubled on it. Calculate the new resistance of the wire.

17.    [3] Two metallic wires A and B of the same material are connected in parallel. Wire A has  length l and radius r, wire B has a length l /2and radius 3r. Compute the ratio of the total  resistance of parallel combination and the resistance of wire A.