Which of the following devices converts Chemical energy into Electrical energy ?
1). Electric heater
2). Electric fan
3). Hair dryer
4). Electric cell
The square root of which of the following numbers is irrational?
1). 3969
2). 5625
3). 6560
4). 1764
What is the mean of first hundred natural numbers ?
1). 50
2). 50.5
3). 51.5
4). 51
From the top of a platform, the angle of elevation of a tower was 30°. The tower was 45 m
high and the horizontal distance between the platform and the tower was $40\sqrt{3}$ m. What
was the height of the platform?
1). 40 m
2). 5 m
3). $45\sqrt{3}$ m
4). $20\sqrt{3}$ m
Non-metal oxides are usually :
1). acidic
2). amphoteric
3). neutral
4). basic