The temperature is lowest here:

1. 1. Stratosphere
   2. Mesopause
   3. Tropopause
   4. Stratopause

Impurities like boron, aluminum, gallium or indium are added to intrinsic semiconductor to form

1. 1. N-type doped semiconductor
   2. P-typed doped semiconductor
   3. A junction diode
   4. All of these

The bonds present in N2O5 are:

1. 1. Only ionic
   2. covalent and coordinate
   3. only covalent
   4. covalent and ionic

Polio is caused by-

1. 1. Fungus
   2. Bacteria
   3. Virus with single stranded RNA
   4. Virus with single stranded DNA

Of the following diseases, which one is caused by insect bite?

1. 1. Scurvy
   2. Dengue
   3. Pneumonia
   4. Asthma

Different types of electromagnetic radiation (x-rays, infrared, radio, etc.)

1. 1. Travel at different speeds in a vacuum
   2. Have different amounts of energy for each photon
   3. Have the same wavelength
   4. Do not always obey the inverse square law

Humidity is measured withy a_____.

1. 1. Barometer
   2. Thermometer
   3. Hygrometer
   4. None of these

Which cell organelles is called the powerhouse of the cell?

1. 1. Endoplasmic reticulum
   2. Mitochondria
   3. Vacuoles
   4. Lysosmes

What is the shape of our galaxy?

1. 1. Elliptical
   2. Spiral
   3. Lanticular
   4. Irregular