1. Is an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program?
Ans: Computer
2. If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?
• 60
• 45
A and B complete a work in = 15 days;
One day's work of (A+B) = 1/15;
B complete the work in = 20 days;
One day's work of B = 1/20;
Then, A's one day's work = 1/15-1/20 = (4-3)/60 = 1/60;
Thus, A can complete the work in = 60 days.
3. Which one is correct?
- Humus is an amorphous, colloidal and dark substance that is the source of energy and nutrients for most soil microorganisms.
- Humus gives the soil a loose texture ensuring better aeration
- both
4. Web style is
- Content of the web page
- Desktop style
5. Sai spends 30% of his salary on house rent, 30% of the rest he spends on his children's education and 24% of the total salary he spends on clothes. After his expenditure, he is left with Rs. 2500. What is Sai's salary?
- Rs. 11,494.25
- Rs. 20,000
- Rs. 10,000
Let Sai's salary be x.
He spends on rent = 30% of x = 30x/100.
He spends on education = 30% from rest of the salary= (30*70x)/(100*100) = 21x/100.
He Spends on clothes = 24% of total salary = 24x/100.
Saving = 2500.
Salary of Sai = x.
(30x/100) + (21x/100) + (24x/100) + 2500 = x.
(75x/100) = x-2500.
75x = 100x-250000.
Or, 100x-77x = 250000.
Or, x = 250000/25.
Or, x = 10000.
Sai's salary = Rs. 10,000.
6. What is internet
- a single network
- a vast collection of different networks
Ans: Fathometer
8. Outlook express is a ________
8. Outlook express is a ________
- E-mail client
- News client
- both
9. Stars twinkle because
- the intensity of light emitted by them changes with time
- the distance of the stars from the earth changes with time
- the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
