1. An electric bulb having voltage 240V and current 0.6 A has a power of _________ ?

40W

400W

144W

14.4W

Answer: 144W

Explanation:

P=VI P=240*0.6 P=144W


2. ......... is least reactive element belonging to group 17 ?

Bromine

Iodine

Chlorine

Fluorine

Answer: Iodine

Explanation:

Iodine is the least reactive element belonging to group 17. The 5 non-metallic, toxic elements that form group 17 of the periodic table are iodine, chlorine, fluorine, bromine, and astatine


3. The force of attraction between two objects is called the ?

centripetal force

electromagnetic force

gravitational force

centrifugal force

Answer: gravitational force

Explanation:

Gravitational force -an attractive force that exists between all objects with mass; an object with mass attracts another object with mass; the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects


4. An ultrasonic sound wave has a frequency higher than ?

20 Hz

20000 Hz

200 Hz

2000 Hz

Answer: 20000 Hz

Explanation:

Ultrasonic waves are longitudinal waves of frequency greater than 20,000 Hz


5. In case of hypermetropia, where is the image formed ?

In front of the retina

On the retina

Behind the retina

On the cornea

Answer: Behind the retina

Explanation:

In hypermetropia image of a object is formed behind the retina


6. In which of the following classifications are the elements arranged in the order of their increasing atomic number ?

The Modern Periodic Table

Mendeleev's Periodic Table

Newland's Law of Octaves

Dobereiner's Triads

Answer: The Modern Periodic Table

Explanation:

Elements, when arranged in order of increasing atomic number, lead us to the classification known as the Modern Periodic Table


7. Which one of the following is NOT linked to the cerebrum ?

It is a part of forebrain

It has two parts called cerebral hemispheres

It forms the front, superior and lateral side of the brain

It is the largest part constituting 60% of the brain

Answer: It is the largest part constituting 60% of the brain

Explanation:


8. The conversion of a solid directly into its vapour is called ?

Evaporation

Condensation

Vaporisation

Sublimation

Answer: Sublimation

Explanation:

Direct conversion from solid to vapour is called sublimation


9. Which of the following produces Testosterone in man ?

Prostate gland

Scrotum

Testes

Vas deferens

Answer: Testes

Explanation:

The testes are responsible for making testosterone, the primary male sex hormone, and for producing sperm. Within the testes are coiled masses of tubes called seminiferous tubules. These tubules are responsible for producing the sperm cells through a process called spermatogenesis


10. Which of the following produces Testosterone in man ?

Prostate gland

Scrotum

Testes

Vas deferens

Answer: Testes

Explanation:

The testes are responsible for making testosterone, the primary male sex hormone, and for producing sperm. Within the testes are coiled masses of tubes called seminiferous tubules. These tubules are responsible for producing the sperm cells through a process called spermatogenesis