# CBSE Class 10 Science Solved Practice Paper 2018-2019: Set-I

Gurmeet Kaur

Before the start of CBSE Board Exam 2019, pre-board examination is the most cruicial preparatory step for the students of class 10. A good performance in the pre-boards is a cursor towards right preparation for the board examinations. It also provides an additional encouragement and boosts your self-confidence. Therefore, students should work hard to do well in their board exams.

In this article, we are providing the Science practice paper for CBSE Class 10, which is specially prepared by the subject experts after the brief analysis of previous year question papers and the latest examination pattern.

Some significant features of CBSE Class 10 Science practice paper are as follows:

• Covers the whole syllabus of CBSE class 10 Science.
• Follows the latest examination pattern for class 10 Science board exam 2019.
• Each question has been provided with an apt and easy solution.
• Questions have been asked from only those topics which are important from exam point of view.

Some sample questions and their solutions from the CBSE Class 10 Science Solved Practice Paper are given below:

Q. State any two major points of difference between the arrangement of elements in Mendeleev’s periodic table and modern periodic table.

Ans.

 Mendeleev’s periodic table Modern periodic table Elements are arranged in increasing order of their atomic masses. Elements are arranged in increasing order of their atomic numbers. There are no separate positions for isotopes of an element as their atomic masses are different. Separate positions are not required as they have same atomic numbers. Some elements of higher atomic masses have been placed before elements of lower atomic masses. Here all elements are placed in right order. It did not soecify the position of nobel gases. It has a separate group for the noble gases.

Q. (a) State Fleming’s left hand rule.

(b) What are the characteristics of magnetic field strength due to current carrying solenoid?

Ans.

(a) Flemings left hand rule states that if you stretch the thumb, index finger, and middle finger of your left hand such that they are mutually perpendicular to each other, then your index finger represents the direction of the field, the middle finger represents the direction of the current, and the thumb represents the direction of the force experienced by the conductor.

(b) Characteristics of magnetic field strength due to current carrying solenoid are given below:

• One end of a solenoid acts as north pole and other as south pole.
• Magnetic field is represented by straight magnetic field lines parallel and very close to each other.
• Magnetic field is uniform inside the solenoid.
• Magnetic field inside a long solenoid decreases as we move towards ends of solenoid because magnetic field lines near the ends of solenoid start spreading out.

Q. Sunita takes a mirror which is depressed at the centre and mounts it on a mirror stand. An erect and enlarged image of her face is formed. She places the mirror on a stand along a meter scale at 15 cm mark. In front of this mirror, she mounts a white screen and moves it back and forth along the meter scale till a sharp, well-defined inverted image of a distant tree is formed on the screen at 35 cm mark.
(i) Name the mirror and find its focal length.
(ii) Why does Sunita get sharp image of the distant building at 35 cm mark?

Ans.

(i) The mirror used by Sunita is a convex mirror. Since it gives a clear image of a distant object at 35cm, the focal length of the mirror is also 35cm.

(ii)Since the focal length has been determined to be 35cm, we know that incoming light rays from infinity will converge at the focus. Since the tree is distant, we can approximate it to be located at infinity. As a result, Sunita gets a clear image of a distant object at the focus of her mirror (white screen).

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रोमांचक गेम्स खेलें और जीतें एक लाख रुपए तक कैश