Which one of the following places is most likely to be affected by a cyclone?

• Puri
  
  

• Mumbai
  
  

• Goa
  
  

• Porbandar

What is the reason of 'stone-cancer'?

• Global warming
  
  

• Radioactivity
  
  

• Acid rain
  
  

• Bacterial activity

On a moving plane mirror, incident ray forms an angle of 60°, then what will be the reflected angle?

• 60°
  
  

• 90°
  
  

• 30°
  
  

• 120°

4.

If $\frac{4}{3}$ and $\frac{3}{2}$ be respectively the absolute refractive indices of water and glass, then the refractive index of glass relative to water is

• $\frac{8}{9}$

• $\frac{9}{8}$

• $\frac{4}{3}$

• $\frac{3}{4}$

An air bubble inside water behaves like a

• convex lens

• plane-convex lens

• concave mirror

• concave lens

Which of the following statements related to earthquakes is not correct?

• The record of the seismic waves is called seismograph

• The seismograph records the seismogram

• The Richter Scale is not linear but logarithmic

• The seismic waves originate from focus

A person using a lens as a simple microscope sees an

• inverted real image

• inverted virtual image

• upright real image

• upright virtual image

Convex mirror is used to form an image on a real object. Point out the wrong statement.

• Image lies between pole and focus

• Image is diminished in size

• Image is erect

• Image is real

You are provided with a concave mirror, a concave lens, a convex mirror and a convex lens. To obtain an enlarged image of an object you can use either

• concave lens or convex lens

• concave mirror or convex mirror

• concave mirror or concave lens

• concave mirror or convex lens

The image of a distant coloured object formed in a pinhole camera is always

• virtual, erect, coloured and diminished

• real, erect, coloured and diminished

• real, inverted, black and white and diminished

• real, inverted, coloured and diminished