JEE Main Modern Physics: Dual Nature of Matter and Radiation – Chapter Test
JEE Main Modern Physics: Dual Nature of Matter and Radiation – Chapter Test is an online chapter test in the JEE Main pattern, covering Modern Physics. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.
Topics in this test
| Topic | Questions |
|---|---|
| Modern Physics | 20 |
Difficulty: 9 medium · 11 hard
Dual Nature of Matter and Radiation MCQ questions with answers
The first 3 of 20 questions. Unlock the series for the rest, each with a solution.
Q1. In which year did Louis de Broglie put forward his hypothesis of matter waves in his doctoral thesis?
लुई दे ब्रॉग्ली ने अपने डॉक्टरेट शोध-प्रबंध में द्रव्य तरंगों की अपनी परिकल्पना किस वर्ष प्रस्तुत की?
- A. 1913
- B. 1905
- C. 1927
- D. 1924
Solution
De Broglie proposed the matter-wave hypothesis in 1924, which was experimentally confirmed by the Davisson–Germer experiment in 1927.
दे ब्रॉग्ली ने 1924 में द्रव्य-तरंग परिकल्पना का प्रस्ताव दिया, जिसकी 1927 में डेविसन–जर्मर प्रयोग द्वारा प्रायोगिक पुष्टि हुई।
Q2. Four physicists are listed: 1. Clinton Davisson; 2. Lester Germer; 3. George Paget Thomson; 4. Philipp Lenard. Three of them are chiefly associated with experiments demonstrating the wave nature of electrons. The odd one out is:
चार भौतिक विज्ञानी सूचीबद्ध हैं: 1. क्लिंटन डेविसन; 2. लेस्टर जर्मर; 3. जॉर्ज पेजेट थॉमसन; 4. फिलिप लेनार्ड। इनमें से तीन मुख्यतः इलेक्ट्रॉनों की तरंग प्रकृति को प्रदर्शित करने वाले प्रयोगों से संबद्ध हैं। इनमें से भिन्न है:
- A. George Paget Thomson / जॉर्ज पेजेट थॉमसन
- B. Lester Germer / लेस्टर जर्मर
- C. Clinton Davisson / क्लिंटन डेविसन
- D. Philipp Lenard / फिलिप लेनार्ड
Solution
Davisson, Germer and G.P. Thomson all performed electron diffraction experiments that established the wave nature of matter. Lenard's celebrated work was on the photoelectric effect, which concerns the particle nature of radiation.
डेविसन, जर्मर और जी.पी. थॉमसन सभी ने इलेक्ट्रॉन विवर्तन प्रयोग किए जिन्होंने द्रव्य की तरंग प्रकृति स्थापित की। लेनार्ड का प्रसिद्ध कार्य प्रकाश-विद्युत प्रभाव पर था, जो विकिरण की कण प्रकृति से संबंधित है।
Q3. Assertion (A): The wave nature of a cricket ball moving at ordinary speed can never be observed in any diffraction experiment. Reason (R): The de Broglie wavelength of such a macroscopic object is of the order of 10⁻³⁴ m, which is immeasurably smaller than the size of any aperture or obstacle available. Choose the correct option:
अभिकथन (A): सामान्य चाल से गतिमान क्रिकेट गेंद की तरंग प्रकृति किसी भी विवर्तन प्रयोग में कभी प्रेक्षित नहीं की जा सकती। कारण (R): ऐसी स्थूल वस्तु की दे ब्रॉग्ली तरंगदैर्घ्य 10⁻³⁴ m की कोटि की होती है, जो उपलब्ध किसी भी द्वारक या अवरोध के आकार से अमापनीय रूप से छोटी है। सही विकल्प चुनिए:
- A. A is false, but R is true / A असत्य है, परंतु R सत्य है
- B. Both A and R are true, and R is the correct explanation of A / A और R दोनों सत्य हैं, और R, A की सही व्याख्या है
- C. Both A and R are true, but R is not the correct explanation of A / A और R दोनों सत्य हैं, परंतु R, A की सही व्याख्या नहीं है
- D. A is true, but R is false / A सत्य है, परंतु R असत्य है
Solution
For a ball of mass ~0.1 kg moving at a few tens of m/s, λ = h/mv ≈ 10⁻³⁴ m, far smaller than any physical slit or obstacle, so no diffraction effects can ever be detected. Both statements are true and R is precisely the reason A holds.
~0.1 kg द्रव्यमान की, कुछ दसियों m/s से गतिमान गेंद के लिए, λ = h/mv ≈ 10⁻³⁴ m, जो किसी भी भौतिक झिरी या अवरोध से कहीं छोटी है, अतः कोई विवर्तन प्रभाव कभी संसूचित नहीं किया जा सकता। दोनों कथन सत्य हैं और R ही ठीक वह कारण है जिससे A सत्य है।
Frequently asked questions
How many questions are in the JEE Main Modern Physics: Dual Nature of Matter and Radiation – Chapter Test?
20 questions for 20 marks, to be answered in 20 minutes.
Is there negative marking in the JEE Main Modern Physics: Dual Nature of Matter and Radiation – Chapter Test?
Yes — 0.25 marks are deducted for each wrong answer, as in the real exam pattern.
Which topics does the JEE Main Modern Physics: Dual Nature of Matter and Radiation – Chapter Test cover?
Modern Physics (20 questions).
Is the JEE Main Modern Physics: Dual Nature of Matter and Radiation – Chapter Test free?
It is part of the JEE Main 2027 Mock Test Series (104 tests, ₹299). You can first try Basic Concepts & Atomic Structure – Topic Test for free.
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