11th Physics ठोसों के यांत्रिक गुण | Mechanical Properties of Solids | NCERT CH 12 | One Shot

Out of the elements H(1), Be(4), Na (11), Mg(12) : (a) Write the pair of elements having similar chemical properties. (b) State the group number of each pair. (c) Name one another element belonging to each of these groups.

In a class, 18 students took Physics, 23 students took Chemistry and 24 students took Mathematics of these 13 took both Chemistry and Mathematics, 12 took both Physics and Chemistry and 11 took both Physics and Mathematics. If 6 students offered all the three subjects, find: (iii) How many took exactly one of the three subjects.

Statement-1:Amorphous solids are isotropic Statement-2:Amorphous solids show physical properties like mechanical strength, electrical conductivity refractive index etc. same in all directions .

How many shots each having diameter 3 cm can be made form a cuboidal lead solid of dimensions 9 cm xx 11 cm xx 12 cm ?

In a survey of 25 students, it was found that 12 have taken physics, 11 have taken chemistry and 15 have taken mathematics; 4 have taken physics and chemistry; 9 have taken physics and mathematics; 5 have taken chemistry and mathematics while 3 have taken all the three subjects Find the number of students who have taken (i) physics only (ii) chemistry only; (iui) mathematics only (iv) physics and chemistry but not mathematics; (v) physics and mathematics but not chemistry; (vi) only one of the subjects; (vii) at least one of the three subjects; (vii) none of the three subjects.

The average of 24 numbers is 65. The average of first 11 numbers is 67 and the average of last 10 numbers is 70. If the 12th number is 13 less than the 13th number and the 14th number is one more than the 13th number, then the average of 12th and 14th number is: 24 संख्याओं का औसत 65 है | पहली 11 संख्याओं का औसत 67 है तथा अंतिम 10 संख्याओं का औसत 70 है| यदि 12वीं संख्या 13वीं संख्या से 13 कम है तथा 14वीं संख्या 13वीं संख्या से एक अधिक है, तो 12वीं और 14वीं संख्या का औसत ज्ञात करें |

Q.N. 45 In a survey of 25 students ,it was found that 15 had taken mathematics , 12 had taken physics and 11 had taken chemistry ,5 had taken mathematics and chemistry, 9 had taken mathematics and physics, 4 had taken physics and chemistry and 3 had taken all the three subjects. write the number of student that had taken (a) at least one of three subjects (b) only mathematics

An examination was held during the 2 weeks of April 3rd-Sunday to 16th Saturday. There was 1 paper for the six subjects - Physics, Chemistry, Biology, Maths, English and Hindi. Only 1 paper per day No exam on Saturdays and Sundays and Holiday on April 5th. Only 3 exams were there in a week. Chemistry was before Biology and Maths was on the next day of Hindi. The day on which the paper of biology and maths were held was the same, while that for chemistry and physics was also the same. There was no exam for 3 days between Physics and the exam prior to it. Hindi exam on Tuesday and one exam between Hindi and English exam. There was at least a gap of one day between any 2 science paper. Which of the following exam was held on April 12th ?