Daily GK Challenge

More practice: Science & Technology GK

5 more SSC CGL questions from the same chapter, with step-by-step solutions. Try each one, then reveal the answer.

1. Q1easy

   Which instrument is used to measure atmospheric pressure?

   • AHygrometer
   • BBarometer
   • CAnemometer
   • DHydrometer
   Show answer & solution

   Correct answer: (B) Barometer

   A barometer (for example, a mercury barometer, invented by Torricelli) measures atmospheric pressure. A hygrometer measures humidity, an anemometer wind speed, and a hydrometer the density of liquids. So the answer is the barometer.

2. Q2easy

   The chemical name of baking soda is:

   • ASodium bicarbonate
   • BSodium carbonate
   • CCalcium carbonate
   • DSodium chloride
   Show answer & solution

   Correct answer: (A) Sodium bicarbonate

   Baking soda is sodium hydrogen carbonate (sodium bicarbonate), NaHCO₃. When heated it releases CO₂, which makes dough rise. Sodium carbonate (Na₂CO₃·10H₂O) is washing soda, and sodium chloride is common salt. So the answer is sodium bicarbonate.

3. Q3medium

   Which part of the human brain maintains body balance and coordinates voluntary movements?

   • ACerebrum
   • BMedulla oblongata
   • CHypothalamus
   • DCerebellum
   Show answer & solution

   Correct answer: (D) Cerebellum

   The cerebellum, at the back of the brain below the cerebrum, keeps posture and balance and makes voluntary movements smooth and precise, for example walking or riding a bicycle. The cerebrum handles thinking and memory, the medulla controls breathing and heartbeat, and the hypothalamus controls body temperature, hunger and thirst. So the answer is the cerebellum.

4. Q4medium

   Vehicles use a convex mirror as the rear-view mirror because the image it forms is always:

   • AReal, inverted and magnified
   • BVirtual, erect and diminished, giving a wider field of view
   • CVirtual, erect and of the same size
   • DReal, inverted and diminished
   Show answer & solution

   Correct answer: (B) Virtual, erect and diminished, giving a wider field of view

   A convex mirror spreads light rays outward, so wherever the object is, the image is virtual, erect and smaller than the object. Because the image is smaller, the driver can see a much wider area behind the vehicle. A plane mirror gives a same-size image, and real inverted images come from concave mirrors. So the answer is virtual, erect and diminished, giving a wider field of view.

5. Q5medium

   Bronze is an alloy of:

   • ACopper and zinc
   • BIron and carbon
   • CCopper and tin
   • DTin and lead
   Show answer & solution

   Correct answer: (C) Copper and tin

   Bronze is mainly copper with tin, and it is used for statues, medals and bells. Copper and zinc make brass, iron and carbon make steel, and tin and lead make solder. So bronze is copper and tin.