The melting points (in C) of Sulphur (S), Aluminium (Al), and Iron (Fe) are 113, 666 and 1535, respectively. Which one of the following is correct?
Only Fe is solid at 200ºC
Al and Fe are solids at 200ºC
Fe, Sand Al are solids at 200ºC
Only S is solid at 200ºC
B.
Al and Fe are solids at 200ºC
The melting point is the temperature at which solid melts (changes into liquid). Here Aluminium(Al) and Iron (Fe) have melting points of more than 200°C. So, they will remain in the solid state at 200°C.
Which of the following statements indicate(s) a good science classroom?
Only B
B and D
A, C and D
A and C
Somia usually takes her Class VII students on a field trip. Which of the following could be the objective(s)?
Only A
Only D
B and C
A, B and C
Which one of the following assessment strategies is most appropriate to assess the experimental skills of students in a science classroom?
Checklist
Concept mapping
Paper-pencil test
Practical record
"Open a water tap. Adjust the flow so that it forms a thin stream. Charge a refill. Bring it near the water stream. Observe what happens. Write a short report on the activity."
The skill (s) developed in the students through this activity is/are
observation, experimentation and creativity
Only observation
Only experimentation
observation, experimentation and communication
Identify the incorrect statement about the nature of science.
Speculation and conjecture also have a place in science, but ultimately a scientific theory, to be acceptable, must be verified by relevant observations and/or experiments
Science is considered as value-neutral and objective, and the laws of science are viewed as fixed
The methodology of science and its demarcation from other fields continue to be a matter of philosophical debate
Even the most established and universal laws of science are always regarded as provisional, subject to modification in the light of new observations, experiments and analyses
Which of the following strategies are most appropriate for a teacher to teach the topic 'Save Energy'?
A, B and D
A, C and D
B, C and D
A, B and C
There are two planets in our solar system whose periods of revolution around the Sun are less than those of our Earth, but their periods of rotation are more as compared to those of the Earth. These planets are
Mars and Jupiter
Mercury and Saturn
Mercury and Venus
Uranus and Neptune
An electric circuit is set up in such a way that the positive terminal of a battery V is connected to a bulb B1 which is connected to a resistor R which is connected to bulb B2. B2 is finally connected to the negative terminal of the battery. Both the bulbs are glowing. If the value of R is increased, then
B2 will become dimmer but the brightness of B1 will remain unchanged
Both B1 and B2 will remain unchanged
Both B1 and B2 will become dimmer
B1 will become dimmer but brightness of B2 will remain unchanged
Read the given statements and select the correct option.
Both Statements A and Bare false
Statement A is correct but Statement B is false
Statement Bis correct but Statement A is false
Both Statements A and Bare correct