List of top Science & Technology Questions

Complete the following table: 

Observe the figure and answer the following questions: 

  1. Name the defect of vision represented in the above figure. 
  2. State the reasons for this defect. 
  3. How is it corrected? 
  4. Draw the diagram to show the correction of this defect.

Complete the following flow chart: 

 

Observe the following figure and answer the questions: 

  1. Which element has maximum specific heat capacity? Justify. 
  2. Which element has minimum specific heat capacity? Justify. 
  3. Define specific heat of an object.

Identify the physical and chemical changes from the following phenomena: 

  1. Transformation of ice into water. 
  2. Ripening of fruit. 
  3. Milk turned into curd. 
  4. Evaporation of water. 
  5. Digestion of food in the stomach. 
  6. Iron filings get attracted towards the magnet. 

Read the following sentence and answer the questions: "$\text{NaCl}$ is an ionic compound." 

  1. Why is \( \text{NaCl} \) an ionic compound? 
  2. State any two properties of ionic compounds.

Observe the figure and name the ray \( \text{AB} \), ray \( \text{CD} \), ray \( \text{GH} \): . 

An element has its electron configuration as \(2, 8, 1\). Now answer the following questions: 

  1. What is the atomic number of this element? 
  2. What is the group of this element? 
  3. To which period does the element belong? 

Complete the following table:

Type of SatelliteThe names of Indian Satellite and launcher
(1) Navigational SatelliteSatellite: \(\underline{\hspace{3cm}}\) \(\hspace{1cm}\) Launcher: \(\underline{\hspace{3cm}}\)
(2) Earth observation SatelliteSatellite: \(\underline{\hspace{3cm}}\) \(\hspace{1cm}\) Launcher: \(\underline{\hspace{3cm}}\)

 

Distinguish between Mass and Weight.

How do we feel about air in each of the following conditions? 

  1. Relative humidity is more than \( 60\% \). 
  2. Relative humidity is less than \( 60\% \). 

Write the name of the small satellite made by a group of students from COEP (College of Engineering, Pune) sent to space through $\text{ISRO}$ in $2016$.

Match the pair: 

Group 'A' \(\hspace{3cm}\) Group 'B' 
Substance  \(\hspace{3cm}\) Refractive index 
\(\hspace{1cm}\)  Air \(\hspace{3cm}\)      (a) \( 1.33 \) 
\(\hspace{1cm}\)  Water \(\hspace{3cm}\) (b) \( 1.46 \) 
\(\hspace{1cm}\)  Glass \(\hspace{3cm}\) (c) \( 1.0003 \) 

Complete the following reaction: \[ \text{C}_{12}\text{H}_{22}\text{O}_{11} \xrightarrow{\text{heat}} \text{..................} + \text{..................} \]
Define periods and groups of the modern periodic table.
Calculate the escape velocity on the surface of the Moon, given the mass and radius of the Moon to be \( 7.34 \times 10^{22} \, \text{kg} \) and \( 1.74 \times 10^6 \, \text{m} \) respectively. (Given: \( G = 6.67 \times 10^{-11} \, \text{Nm}^2/\text{kg}^2 \))
Lemon or tamarind is used for cleaning copper vessels turned greenish.
Complete the co-relation: \[ \text{CuI}_2 \text{: Brown} :: \text{AgCl} \text{: ............................} \]
For electric power transmission, copper or aluminium wire is used.
State True or False: "Wavelength of red light is close to \( 700 \text{ nm} \)."
Elements belonging to the same group have the same valency.
Find the odd man out: Loudspeaker, Microphone, Electric motor, Magnet.
The power of a convex lens of focal length \( 20 \text{ cm} \) is ....................
The height of medium earth orbit above the surface of the earth is :
If a ray of light passes from a denser medium to a rarer medium in a straight line, the angle of incidence must be ................